I'd suspend them now, give Leicester the FA cup, take their results away from the league and let Everton, West Ham and Leicester fight out for the title.
If they fail to walk away from the Super League in two weeks, then relegate them for next season. Every season they remain in the Euro League relegate them again. It means they'll have to play lower league teams or walk away. They will also fall under FFP but exclude the money from European Super League from the calculation. Keeping them in the league, gives us the opportunity to influence them negatively further, just booting them straight out means it's us vs them and we have no power or influence at all ever again.
If there is any attempt to treat them with kid gloves, it won't work, we all understand that now. Need to play strong with them.
I would also get the PFA in the ear of the players. If they are denied the opportunity to play for their countries, there are potential losses of earnings. Help the players that are interested in a class action law suite against their clubs with every legal help we can. We need the players from those clubs onside with us, or at least half of them.