One option might be to convert to an LAPL(A). The recency requirements have a little more wiggle room than SEP rating revalidation/renewal, allowing you to dabble in aviation as & when without involving expensive examiners or even an ATO. Any EASA FI would be allowed to supervise & authorise your flying.
Should you ever want to convert back to a PPL(A) with an SEP I presume you would already meet the requirements of FCL.210.A (a) but you might want to check before burning that particular bridge.