A part like this is begging to be done on a resin machine. You can’t beat them for the kind of shapes and tolerances you’re working with here.
I’d give it a go on my FDM machine, but I have .8 nozzles loaded right now - no hope haha.
I’d be happy to turn a few of these out in resin if you don’t have a machine, would only ask for the freight cost.
Spend enough time talking to HMRC or DWP, and it just happens.