Yes, the UK Champs as a pre qualifier is a potential solution, the only real issue I see is finding a good balance between letting in enough teams that you allow for a bad run in an elim (which is a very bad way of ranking teams), and capping it at a low enough number you can have a realistic qualifier.
I'd suggest it might be better to take the top X teams from the Swiss Rounds to the qualifier, rather than from the Elim (finding the best team in the UK, and the top X teams in the UK are very different aims, and lead to different tactics etc).
Yes, the UK Champs as a pre qualifier is a potential solution, the only real issue I see is finding a good balance between letting in enough teams that you allow for a bad run in an elim (which is a very bad way of ranking teams), and capping it at a low enough number you can have a realistic qualifier.
I'd suggest it might be better to take the top X teams from the Swiss Rounds to the qualifier, rather than from the Elim (finding the best team in the UK, and the top X teams in the UK are very different aims, and lead to different tactics etc).