I hope that you're right with this ending with an 18 game league, but fear that it will end up like an airport wait for a delayed flight where the bad news about further delays is drip fed every 30 minutes or so. Here tiers 3 and 4 would be on the receiving end of fortnightly announcements further extending the shut down of the lower leagues till it's too late to get going again.
I wouldn't be surprised if the BetFred continues as the semi finalists are from the premiership.
The Scottish cup could continue with all remaining teams below the championship thanked for their participation, with a suitable hand out depending on whether they were still in the draw or out at one of the completed rounds. Then the cup gets played out with the 20 remaining from the top two tiers, Alloa being the only side already out, and Morton - Dunfermline goes ahead to see which one will be in the next round, then 4 ties and 12 byes.