Spoke with my airline mentor today and described it, he said multiple dudes have done what I am asking to do without issue but to make sure no orders extension, orders end before training is over, leave covers the entire period and have the orders marked as Terminal as I will be ending my tour from FTNGD on these T32 orders.
My risk mitigation is to have the OG sign the leave request (he's ok with my plan), state in the Remarks section pre-retirement employment training and document coordination & approval in an email if things get weird.
If shit gets crazy, I'll let go of my double secret probation double dip legally plan and cash the leave out at retirement date, it's just so far all my direct POCs have not shut the door on this. My orders run out in 3 months with no more requested or expected.