What you need is a restricted type rating based on a 3rd country licence (i.e. your GCAA licence). EASA fully provides for this but for some reason the UK CAA has decided not to adopt it.
I'm sure you know this but what it does enable you to do is to keep your EASA licence "live" without being able to actually use it. Once you have the type put onto your licence (usually for a fee) then you just send in a pdf of your LPC every 12 months and your EASA TR and licence then become valid for another year. Simples.
I can't comment on other EASA states, but the Irish Aviation Authority have fully implemented this rule and therefore might be an option for you. It's either that or pay for a full sim check every year for your UK licence. I have found the IAA to be extremely helpful and flexible and will answer any questions you may have.