Yeah, it's a tricky one. Like you say, Dundee surely won't fancy 2 games in 4 days (if the SPFL can actually order the match be played elsewhere on Sunday) and Hibs might well object to it being played after their last fixture (if it leaves Dundee knowing exactly what they need to get into the top 6). Then there's us.
One thing you can pretty much guarantee - when the authorities are faced with a tricky situation, they'll come up with the most lamebrained solution imaginable.