I'm also sure that if by any chance the flag wavers achieve any sort of independence any future SG would do whatever they could to make it hard for Rangers to leave. The Wales/England model works and is accepted if the clubs give up any rights over European competition in their respective nation and only qualify through their chosen league, as per Swansea and Cardiff. The model could easily work and would be easier if any move was made BEFORE the likelihood of any independence.
Just think how much extra money Rangers would get in either the Championship and hopefully EPL, though it would be a nightmare for me for two games each season
Hypothetical I know on both counts, but its fun to speculate.