Buy a Peet shoe/boot dryer. Put your shoes on the dryer after each ride or when you wash them per some good instructions above.
The boot dryer does a very good job at drying the shoe without too much harming the construction. I’ve used them for years for ski boots and they do a great job drying a sweaty cycling or running shoe.
I’m always surprised that Peet doesn’t market them to athletes, it seems they market to hunters/construction workers.
You can find them at most work boot stores, Wal-Marts, Ebay, etc. Don’t pay more than $30 as that is MSRP.