This would be brilliant, and I'd sign up for it in a heart beat, even if it meant giving up my British citizenship.
Just because a bunch of ignorant and all too often xenophobic arseholes want to give themselves a buckshot facial doesn't mean the EU should just turn their backs in all those Brits that were happy being a part of the EU and want to remain as a citizen in the wider European community.
I simply can't afford to leave Britain before it leaves the EU, and elderly relatives would prevent me from doing so even if I could. The EU leaving me an olive branch I can use to rejoin them down the road when I'm able, would be the only good thing in this entire fucking disaster of a national suicide pact I and half the British people have been forced into.