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If I am dying quickly, I don't think I will be in a position to choose who to receive sacraments from.  I hope my family will choose wisely.  But if they don't, I will take what I am given.  God will know my hope and desire.
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If I get a terminal illness and have time to have a choice, that is a different matter.  In this case, I would not accept from Fr. Pfeiffer.
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Make first Fridays, if possible.

One question is, whether Canon Law punishes those who receive sacraments from heretics or otherwise illegit clerus.
Another question is, whether graces flow.

Here some quotes concerning the 2nd question.

The Church is clear on this.
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If you willingly receive sacraments from a known heretic or illegitimate cleric, you commit the same mortal sin as the cleric administering the sacrament, and no grace flows where mortal sin occurs.
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If you receive sacraments from illegitimate or heretical clerics in ignorance of their status, you commit no mortal sin but no grace flows either because the cleric commits mortal sin in administering such.  No grace flows where mortal sin occurs.
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This is why it is so important to make sure your cleric is legitimate and that he does not teach heresy.  
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Fr. Pfeiffer has yet to provide indisputable proof of his conditional consecration and legitimacy of his lineage.  My sister heard Fr. Pfeiffer teach heresy.   She questioned him on it and he stood firm on the teaching.  She verified with several bishops, including +Williamsom, informed Fr. Pfeiffer, and he still stood firm on his teaching.  Fr. Pfeiffer, in my mind, is a heretic.
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In this crisis of the Church, no cleric should refuse to provide proof of his lineage.  If he does refuse, run away from him.

The Church is clear on this.
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If you willingly receive sacraments from a known heretic or illegitimate cleric, you commit the same mortal sin as the cleric administering the sacrament, and no grace flows where mortal sin occurs.
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If you receive sacraments from illegitimate or heretical clerics in ignorance of their status, you commit no mortal sin but no grace flows either because the cleric commits mortal sin in administering such.  No grace flows where mortal sin occurs.

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This is completely false. Jone's Moral Theology has this to say: An excommunicatus vitandus or an excommunicatus per sententiam declaratorium vel condemnatoriam may not confer a sacrament on anyone who is not in danger of death. In danger of death one under such censure may only give absolution (Canon 822); however, he may administer the other sacraments at the request of the faithful if no other minister is present (Canon 2261). The same holds for one who is suspended from administering the sacraments per sententiam declaratoriam vel condemnatoriam (Canon 2284). Other excommunicated or suspended persons may administer any sacrament at the request of the faithful (Canon 2261), provided they have recovered the state of grace.
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Moral theology, §454.4
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Thus, even an excommunicated cleric can administer the sacraments at the request of the faithful unless he is under a declaratory sentence (which none of the people we are talking about would be).
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For convenience sake, here is the full text of Canon 2261 (all numberings are from the 1917 Code):
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An excommunicate is prohibited from licitly performing and administering the sacraments and sacramentals, except in the following circuмstances:
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2. The faithful can ask for the sacraments and sacramentals from an excommunicate for any just reason, while observing 3. below, especially if other ministers are absent, and then the excommunicate who is asked can administer the same, nor is he bound by any obligation to ask the reason from the person requesting it.
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3. However, the faithful can ask for sacramental absolution only in danger of death from those who are excommunicated vitandus or other excommunicates, according to the norm of Canon 882, 2252, and even the other sacraments and sacramentals if there are no other ministers available.