This is never going to happen. They last for all of 3 minutes on their own website. They'd have to specially run every set just to make grab bags to sell them at a "discount" on MD. Sorry guys.
I don't get the big deal about grab bags! What's the point in not knowing what you'll get?
The novelty jelly keys in this poll are super cute though, I hope those (or the jelly coral reef keys) are a drop someday
These bags are generally garbage keys. If you want to waste your money I can give you my paypal and bitcoin address and you can just give me your money. I might even mail you some ruined artisan keycaps!
Odds are very good this will never happen. SP already sells out what little they have on their own and basically sell out immediately. The nature of grab bags doesn't really make sense from a group buy perspective.