I remember United playing Wrexham in '91 cup winner's cup run when the Welsh teams were still entering the Welsh FA Cup and qualifying that way. Thought we'd seen the last of that.
Not sure if I like this idea, would have to ask the fans of the smaller Welsh teams. Denies a club a place in Europe, because lets face it one of these are definitely going to win it. But it's not like they go far in Europe currently barring TNS this season, and it would mean a good chance of seeing their team play Swansea, Cardiff, Wrexham etc. fairly regualrly which would be fun for them. Don't know what they'd prefer.
There are some anolamies still existing in European football, so would assume it's legally ok. Never tried it, but from playing Football Manager games there's a challenge that people try with FC Vaduz of Liecehnstein who play in the Swiss Leagues. They can't qualify through their position in the league but can from winning the Liechenstein cup which they still enter. The idea is to try and get them to win the Champions League. Win the cup which gets them into the Conference League, win that which gets them into Europa, win that which gets them into the CL. Fail at any stage and you're back to the start unless you've boosted the Liechenstein co-efficients enough to win directly into the Europa or CL through winning the cup by some good showings in Europe.