Hi,
I'm in no rush as I've had my NPPL(SLMG) for over 2 years now.
All my hours are on TMG (T61F Venture, Grob109B etc) rather than sailplanes with a retractable engine.
What was clear in the past was how to add an SSEA rating to an NPPL (i.e. differences training - no need for a skills test - instructor to sign it off in your log book - send of to NPLG with money to have rating added).
What is not clear is how this will work on the LAPL TMG or EASA PPL TMG. There does not seem to be a formal ratings system. Which is confusing me as I thought TMG was a rating and they are happy to inlcude that in the license title.