Civi and Mil pilots have been working together for decades and producing the very best results - Much flying training and aircraft positioning was done through Civi contractors in WW2 and beyond.
In 1995 EFT for RAF, RN and AAC was successfully contractorised under JEFTS (Huntings). This became LAFT2 (VT/Babcock)/ 3FTS in more recent years.
And today you can join as a civilian gliding instructor:
https://www.raf.mod.uk/aircadets/wan...instructor.cfm
As for payscales I very much doubt the AT civi pay is better than a decent pension and Flt Lt salary / Spec Aircrew wage.