At the moment, selling to the EU just requires filling in VAT and EC Sales List tax forms. This paperwork is all automated by accounting software.
If selling from a UK Ltd company ever becomes a problem, it is a simple matter to create a company in an EU country so I can continue to sell services and products via that. Having residency isn't required to setup and run a company in many EU countries, so I suspect I'd be able to continue working without worry.
The only issue would be transferring over income from a foreign country in a compliant manner. If that becomes expensive, then it might be worth moving residency to a different country. But rushing to make a decision seems rather silly when the decision depends on details that haven't even been talked about yet.