BEagle thanks for the reply.
I will probably go for your option (1)
I am not usually short of hours for SEP revalidation, so it would not matter if those in the motor glider did not count.
BUT, you say that the TMG is a JAA class rating.
As I only have a dear old 'for life' CAA PPL, I assume that I would have to pay a large cheque to the Belgrano to get a JAA PPL, just to have something to attach the TMG class rating to!
Thanks for clarifying all that for me - the advice system on this forum sure beats the CAA!