I think I'm going to give this a try. Here's my strategy:
First, measure hematocrit.
Purchase: 100 heparized hematocrit tubes ($20), 200 lancets ($1.50).
Household plumbing putty, measuring tape instead of dedicated microcapillary reader, and instead of buying a clinical centrifuge, I'll just tape the tube to a bicycle spoke and run it on my fluid trainer for 5 minutes.
Then start the breathing exercises. Looks like 135 minutes/day.
Should work fine.