What are your problems, step by step, because I do not have any. (I had a lot, though). I only can vouch for M4 hardware, though.
And FPC binaries are not dropped from Debian yet, not from releases. The work for that has been/is being done by adapting the packaging to GTK3 and communicating that the inclusion of GTK2 libraries is not used in the core, but for legacy support and that is legal. I have heared that is more or less already accepted.
The age of the release does not matter to Debian, it never has, as long as GTK2 is removed and there is maintenance.
Anyway the version for the M series can't be 5 years old yet, because the M series did not yet exist apart from the M1 which was sold alongside Intel hardware that was also still in production.
Fpc's release for M1/Aarch64 is 3.2.2 and dates from May 20th, 2021.
(Ok,Ok, almost 5 years)
Most issues stem not from the compiler, but from the tools anyway.