I am an similar situation CAA UK holder here.
I did the A320 TRI course with my previous EASA company (the 10hrs where, according to their syllabus LIFUS additional training was included) unfortunately I did the Aoc in the Sim but I left the company for a non EASA operator before I could do the AOC in the aircraft.
In order to add LIFUS I just need to do an Aoc with an EASA TRE in the aircraft? Is my understading correct?
what is your opinion on that?
thx for help