I'm not quite sure what would happen if Stranraer B won the South of Scotland. Would the team in second automatically be chosen for promotion or would no one achieve promotion that year?
The idea is to start the colt teams in the 5th tier. This would create a new league in the west which is highly needed for other clubs to progress up the pyramid. Adding Rangers and Celtic colts into a Lowland West would give teams like Auchinleck, Clydebank, Pollok, etc a chance to gain promotion without too much travel. Other teams such as Glasgow uni, Cumbernauld colts, East Kilbride, bsc glasgow would also then slip in.
The only issue I have with it is the level they are able to move up to. I think the Lowland/highland league should be the cut off, or if it's in league 2 then regardless of where they finish in the league another team is promoted in their place.