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And I don't now whether any of the main or original sedeprivatonists thought through this.

But my own flavor of sedeprivationism has the following consequences:

If a material-only pope appoints a bishop, then that bishop is legitimate, and provided that he himself does not have an impediment to formally exercising the authority of the Episcopal See, then he himself does have ordinary jurisdiction.

This completely wipes away the ecclesia-vacantist objection to sedevacantism.  I'm entirely certain that there are some members of the hierarchy who are not pertinacious heretics.  Very few are not in material error, but there are some who are not at all pertinacious but are of good will ... buying into the Vatican II nonsense only because they believe it to have been the teaching of the Church.

Now, you could argue that they are not valid bishops ... but that is true only of the Latin Rite.  Eastern Rite consecrations and ordinations are still entirely valid.  So if you could find any non-pertinacious Catholic bishops in their ranks, then these men hold ordinary jurisdiction.

I've never understood this objection anyway. The Church is not vacant, and no sedevacantist ever said it was. The Church is composed of all baptized believers who profess the true Faith. There are at least thousands, and probably millions of such people in the world today.

There still needs to be a hierarchy or the Church has defected.