Great idea! I would love to see other variants in daily chess. I think Bughouse and other variants like crazyhouse may be hard, though. The other ones you mentioned as well as Antichess, Horde, and (possibly) atomic chess would be great to add to daily and to live.
I have a suggestion, at live chess, there are lots of variants but at daily, it is only standard and 960. Why not add, King Of The Hill, Crazyhouse and 3 Check to daily chess, and maybe Bughouse too?
What do you think?
Thanks