Come to Gibraltar instead. You’ll have Spain on your doorstep while still being located in Britain. The offshore banks here use the UK banking system (Natwest’s sort code is 60-60-60 and I have no trouble using the Faster Payments System to transfer to my UK onshore accounts). The local banks here also wont open accounts for new customers (apparently when Barclays shut down 2 years ago, the remaining banks were overwhelmed with low balance customers), so there is a large base of workers (10,000 cross the border from Spain to work and most currently get paid in cash) who are just itching for your product.
There may be some tax benefits for you too
Did I mention it was 26c here today with a nice breeze?