I know there are wire bending tools/jigs you can buy, but they are meant for replicating grab handles of different sizes. If you’re not making something complex like compound curves, you could build a jig out of some plastic card, form it off the model, then trim and drop in place. I’ve only had a couple wire bending projects for my builds, but I got them done with a pair of needle nosed pliers and some guesswork, so I can’t help too much.