If you are designing a training program from scratch, just think of what kind of knowledge/skills you think an LTC would need - I’m sure as long as you’ve put some thought into it, it should be acceptable to your authority.
A full T&L course isn’t a bad start, combined with a session or two (or three) in the sim, consisting of RHS (re)familiarisation and check, UPRT, takeover techniques, patter/intervention, rejected/balked landings, etc.
A full TRI course for an LTC is a huge overkill, IMHO. An LTC doesn’t need to know how to operate the sim, teach abnormal procedures, most manuevers (including UPRT), or even most of the normal procedures to be fair, as the student should have demonstrated this by the time they arrive at the line training stage - how else would they have passed their LST? Let alone AoC in the aircraft, even a lot of TRI/Es don’t have that, unless they do base training or ZFTT.
It’s much more productive to focus on skills they actually need to be an effective LTC.