Unfortunately, there is no perfect solution......Mandating maintenance training buys into a lot of issues. Where do you start and where do you finish? What standard of quality are you achieving. Do we need an " approved workshop" as GA does? is your tooling good quality. Do YOU really know what you are doing? Not all GA shops are across ALL aspects of it either. Easy to bite off more than you can chew.
I'v e always pushed the tube, fabric and wood construction where there's lot of info about especially from the USA where they do it very well. It's relatively cheap and easy to maintain but does need a weight increase for a 2 seater to about 700Kgs for full strength and a reasonable payload..
WE like to have access to the full monty including carbon fibre where probably only the factory can repair the thing IF it can be repaired.. Same as a high performance glider. or an executive jet...
I'm very much for self maintenance and won't be there if it's curtailed. Lift the level of general awareness by education as the US does . Not by restriction and documentation and extra cost. IF you aren't capable fine It's not compulsory to do your own. Get some one good who will do it for you
WE are not an airline carrying passengers. Our restrictions (of privileges) allow for the extra latitude given. That is the essence of this pastime. You are responsible for YOUR welfare, and if you are a real dill you will stuff up even the best plane by not watching what you are doing or listening to advice. Nev