wow peaches, this is hard!! And after all this time.

Someone on this forum used to do an uneven split - could you do something along the same lines, like this:
week 1 session
week 2 session
week 3 miss
week 4 session
week 5 miss
week 6 session
week 7 session
week 8 miss
week 9 session
week 10 miss
etc

like that? it works out to 2 -3 sessions per month, but not quite as hard as twice a month. Just thinking.
Over time you get used to processing at a certain rate, and a change (whether sessions closer together, or farther apart) can be hard to adapt to; but you can do it. You have fuond the right T, and she's worth holding onto. I hope it works out for you