I often think the whole "if you can't beat them, join them" on the Stadium sale loophole , but as you only really get 1 go at it the timing needs to be right.
If I understand correctly the FFP measurement is based on the most recent 3 seasons. Looking at our last 3 seasons where 2 of which included parachute payments, I would suggest we are compliant. I've nerded a bit and reckon playing this trump card (if needed) wouldn't be until the 2021/22 season (provided we've not secured promotion beforehand). But I would guess by that time the EFL would have closed such loopholes with rule amendments.
Just thinking out loud.