well... I finally got an email back from the finnish CAA and its all good news!!!
Here it is:
We regret the delay of our answer.
If You take MGPL-course, no theory credit may be granted for PPL-training. BUT: If You take a PPL-course, which will be conducted on TMG (touring motor gliders, in fact precisely the same aircraft but for different training) class, then You have a normal PPL. To fly small Cessna or Piper after that You just have to get class rating training for new class SEP (single engine piston, a few hours).
The experience requirement for PPL is 45 hours (JAR-FCL 1.120), but the minimum "syllabus hours" are only 35 hours (JAR-FCL 1.125). Those unspecified 10 hours may be flight time in Australia. A current and valid Australian license may be converted to JAR-FCL license as mentioned on JAR-FCL 1.015(c)(2) (and appendix).
http://www.jaa.nl/publications/publications_jars.html
Kind regards
Finnish Flight Safety Authority / Flight training and licensing
So this ends up being a very cheap way to do your PPL!!!