I'm skeptical of metrics like "x% of people involved said they were satisfied" for estimating cost-effectiveness. Customer satisfaction doesn't really connect very well to any of the things I care about; in most cases I'm happier with a rough estimate of lives saved/units of suffering prevented/QALYs purchased/etc. per dollar than with a more precise accounting of things that touch less directly on the end goal.
Dunno if it's still helpful, but https://www.highimpactprofessionals.org/talent-directory is a directory of EAs looking for work and contained several each of lawyers and accountants on a quick search.
I think speculating about what exactly constitutes the most good is perfectly on-topic. While 'murdering meat-eaters' is perhaps an overly direct phrasing (and of course under most ethical frameworks murder raises additional issues as compared to mere inaction or deprioritization), the question of whether the negative utility produced by one marginal person's worth of factory farming outweighs the positive utility that person experiences—colloquially referred to as the meat-eater problem—is one that has been discussed here a number of times, and that I feel is quite relevant to the question of which interventions should be prioritized.
There was an attempt at that in rationalism, Dragon Army, though it didn't ultimately succeed; you can find the postmortem at https://medium.com/@ThingMaker/dragon-army-retrospective-597faf182e50.