Sounds like you have the idea so go for it and I am betting those who show will be first in line, I don't show but i know what it's like to try and pick up a goose and keep thsoe wings down at their sides.So I hope you can come up with something, be sure to post back here when you do we have...
Not sure exactly what you mean by harness feather protector but Nettie makes harness for poultry she maybe able to help you https://www.etsy.com/shop/PartyFowl
Welcome