helix if your using a flip up visor from the clone trooper I'd use a couple short flat pinheads inserted and glued into the mando helmet to secure it and allow movability...
I don't remember ever seeing this added to a mando bucket in figure form but I know I've seen costumes with the concept implimented, just don't remember where.
I messed with this idea a little bit a while back when i was doing more mando customs. But I was trying it out on a non-removable boba head/helmet because it'd have more area to secure the pins for the visor to attach to.