Frankly, I think this is a wonderful idea. Don't give them a lot, don't let them redose, keep the comedowns easy.
I seem to be one of the few people who have noticed that he is not using the MDMA to treat depression, he is trying to use it as a one-off to treat the CAUSE of the depression.
MDMA therapy was a highly succesful tool for repairing relationships and working through problems, and this certainly seems the plan.
OP, I HIGHLY recommend you find some literature which speaks about this somewhat. In particular, I have in mind PIHKAL by Alexander Shulgin. it may be available online, but there is a chapter which speaks about MDMA therapy and how valuable it was before the ban. I think you'd find it helpful, and it's also excellent reading.