Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
As far as hold-downs go, a member here, Scobey, shared this that he built for shorts, that could start the creative process to build one for your hoods.
I think I'm going to go with the transfer method, and follow it up with never agreeing to print on a digital camo hood with a liner ever again.
About the only thing that will work is a sports clamp.https://www.livingstonsystems.com/shop/popular/sports-champ-8/Good Luck!
If you really watch your curing temps, I have actually used standard poly whiteto make a transfer. Once I even added some stretch additive to put them on a realstretchy women's rib knit.