maehh,
Maintenance was never going to be your major problem ( but you do need a formal arrangement with CASA to produce an Australian MR -- after the local MRO has done the required) but legally flying an aircraft that DOES NOT have a standard/normal cat. C.of A.
Don't get hung up about maintenance.
As I have tried to explain, under normal circumstances, an Australian Experimental or Limited certificate is not valid outside Australia, without the express permission of the national aviation authority(s) involved.
Taking a (say) VH- Yak 52 to Europe is too hard/expensive.
Buying same in EU and putting it on the Australia register in EU is too hard/expensive.
The $$$ cost of either of the above would be frightening -- unless money doesn't matter.
The cheapest option, if you are determined to be an owner of such an aircraft, is to acquire one in EU, then sell it or bring it home after your stint in Europe is finished.