If I was interested in taking an easier route I'd just run an infinite PP recharge trick. Looking to see how far something sub optimal like ability burn, can be pushed. Hence the post regarding it.
I guess you didn't understand me.
Let's try again.
Just use Fission.
If the duplicate dies you don't rejoin, allowing it to burn it's Ability Scores as much as you like. Just pick up Death Ward or something.
I offered a suggestion that can push the uses of Body Fuel and Ability Burn as you mentioned in your first post.
Also it's not really infinite unless you are completely out of pp and storing points in items. For example, say the original as 20s in Str/Dex/Con, and 50pp. He expends 13pp to Manifest Fission leaving him with 37 which is then split evenly between the two bodies (18 each). The clone can then only use Body Fuel nineteen times, generating +38pp. Since no rejoining occurs the pool is never merged. The original went from 50pp to 18pp, a net loss of -32pp, to produce a clone that has to expend up to 56pp within a few rounds before killing it's self which isn't terrible but it's certainly not infinite. And if you started at a higher pp amount you'd lose even more due to the resource split (@300 you'd drop to 143, a -157pp loss).
But if you store 13pp in a Cognizance Crystal and expend all your pp (or maybe keep 1 depending on how DM rules rounding) then
use the Crystal to manifest Fission. The source split is 0, the duplicate uses Body Fuel to produce 38pp, recharges the Crystal, and has 25pp left over which is kind of nice even if the main body runs around without pp and needs a couple rounds to get things going. And yes, in that
usage it is kind of infinite. All well.