Invite foreign under 21 year old sides into Scottish Challenge Cup

I love the Scottish Challenge Cup. It is primarily a trophy for lower division sides in the Scottish Soccer League. Team form the 2nd, 3rd and 4th tiers play in the trophy. I love the way English, Welsh and Irish sides are invited into the cup. Plus the under 21 year old sides of every Scottish Premier side.
I think another improvement would be to invite the under 21 year old sides of the big English sides into the trophy. Imagine if we could invite the under 21 year old sides of Manchester United, Arsenal, Liverpool, Everton, Chelsea, Spurs, Manchester City, Newcastle United, Aston Villa, Sunderland, Leeds United, and Nottingham Forest into the trophy. These clubs have massive supports even for their reserve sides. So they could attract fans to the trophy. It would be fun, to have future England stars playing in competitive games against Scottish sides. Yes the trophy would be won by English sides. But it would be worth the sacrifice, for Scotland to see future legends of the game playing in Scotland. I think big English clubs would be happy to play in the trophy, because they would enable young English sides to play in competitive games at a young age.