Cosmos.
It is not always possible to have a ferry aircraft fully equipped. In fact the very reason for ferry can be to take the aircraft to have it equipped.
Have ferried on many instances with no RVSM, no TCAS, No 8.33, no INU etc and have usually found ATC very accomodating.
There is nothing magic about it you just ask and if they can do they will
If not you just have to go round, under or over
