Dewoitine,
Mate, do not fret. FS have never and will never will certify the 6 landings on their ATO. This is not part of their service and will never ever assume the legal responsibility for some organisation they have never dealt with. They only do the ground school and the sim.
The procedure is to do the rating at FS then come back to Europe and do the landings with any European ATO / TRTO. Just over a year ago a friend of mine did a type rating in Holland on a Dutch TRTO under Dutch JAA approvals with a Danish examiner on a Danish licence and the landings in England with an English AOC company and got an EASA type rating whilst everyone was meant to be using EASA! It can be done. You just have to check that the authority will accept the TRE you are going to use for the LST and the landings. The TRE may have to contact the Spanish CAA for a briefing.
Best wishes
MM