So you're talking about specifically pro-Resistance Catholic action. As my wife pointed out, that's not the same as Catholic Action. The two are not the same thing simpliciter.
In other words,
1. You could have little to no Resistance-specific Catholic action going on, and still have quite a bit of Catholic action or helping/building up the Church in general.
2. Everything "generic" like Gregorian chant, general Catholic books, chapel veils, Catholic apologetics, even pro-life action is a sub-set of the Resistance.
Picture a circle labeled "Catholic" and a slightly larger circle around it that is labeled "Resistance". What you want is stuff in between those 2 circles. But everything inside the smaller circle is ALSO inside the larger circle, so...
In fact, inside the "Catholic" circle would be a smaller circle labeled "natural law" which would include pro-life work, political action, etc.
My next question is, what exactly needs to be done? Generally an apostolate or life-work is going to meet some need.
Considering there is a huge priest shortage, and by extension a shortage of Resistance or independent chapels across the United States (many Catholics can't get to one, even with a 15 hour drive!) that would seem to be a much more pressing need. What specifically pro-Resistance great works of action (public, outside the home) are these isolated Resistance Catholics supposed to engage in, considering they have no fellow parishioners and not even a place to attend Mass on Sunday?
What can a single individual do for "Resistance-promoting Catholic action", aside from hold up a cardboard sign at a busy intersection? Everyone would just assume he's homeless and/or crazy.