I believe to have found a strategy that lets you get a small boost off of Miis in hub worlds like Greenhorne Town and such. If you want to see the clip I made of it contact me on Discord. My name is itzDutch#0838

I believe using this strat is a very small time save but could build up time save if done as often as possible and consistently.

Forgot to mention this but you have to send me a friend request first because I have a setting on that only friends on Discord can DM me.