"I believe you can still get a credit for MCC as long as you have >350hrs multicrew."
No such credit mentioned in LASORS F10. Only QSP(A)s "who have completed an operational conversion unit course on a
multi-pilot aeroplane type, and have not less than 600 hours operational experience as a pilot on such a type, will be credited the MCC course.
For this purpose, the following types are deemed to be Multi-pilot aeroplanes:
Andover
BAC 1-11
BAe 125 (not Dominie)
BAe 146
C17 Hercules
Jetstream T3
Nimrod
Sentry
TriStar
VC10"