Gryffin -
Crocs... I was wearing them at the NJ Pirate Fest with skull and bone pop-ins.
I usuall wear a pair of pc buckle shoes that have broken my feet in, not vice versa.
For long term standing or parades, etc. I've considered making up a pair of NB or equal walking shoes in black and shoe buckle added, perhaps to the velcro closing ones.
Although these alternatives are not period correct, foot health should be a #1 concern especially for folks with underlying health issues.
Jas. Hook