Just a thought, possibly whacky!
You question whether you want to keep on flying at all, so I would caution against anything that 'locks you in', such as buying something, joining a group, or starting to learn a new aircraft type. It seems to me your best bet is to build on the skills you have already, and rent to retain flexibility.
A lump sum won't last forever, so you must decide when to spend it. Sensibly you say you don't want to spread it out, only barely staying current. But I'm guessing you don't want blow it quickly either.
So how about this? Plan to fly 2-3 months a year, when the weather is (theroretically) good, but fly lots of hours then. Flying while current is much more relaxing.
Accept you will need a few hours with an instructor to get back current, then some solo hours on the basics, but then rent a decent aircraft to do something adventurous. You will have to define "adventurous", but e.g. touring UK/France/Europe/...? The non-flying time gives you time to research and plan.
Ordinarily renting doesn't offer much flexibility, but once you become current again, with a decent sum to spend over a short period, the economics should change.
If the first year's adventure turns out badly, then you still have the flexibility to quit or try something else the next year. If it goes well, no amount of money will ever be enough
One more thought, if you can find a fellow minded PPL, then you could double your spending power, fly safer and have company too.
2c from 24C.