'Nationally accredited licences' will not be valid for flying EASA aircraft after 8th April 2018.....
The G120TP is not an Annex II aeroplane, so a civil pilot must meet EASA regulatory requirements. Which means the relevant Part-FCL pilot licence, Type / Class Rating, Instrument Rating if flying under IFR, Aerobatic Rating if flying aerobatics etc etc.....
These 'stringent EASA regs' are no more than are required for civil flight instructors at somewhere like Kidlington or Jerez, so why should a civilian flight instructor flying for an MFTS contractor be considered exempt?
Perhaps abiding by relevant EASA regulations might actually reduce risk?
Turning to another MFTS aircraft type, have any of the Cranwell-based Phenom 100s flown yet, apart from their delivery flights?