What equipment do you have available? Would you be prepared to spend money on buying a pen Wizard?
Asking as it's impossible to suggest a way of doing something, without knowing what you have available, and if you're prepared to spend money on "TOYS" like a Pen Wizard??
I modified my PW to be able to do a slow twist, whether it's slow enough, I don't know, I did post a couple of thread on the Pen Wizards sub forum a while ago, "Some more mods. KBs Pensnmore (01-01-2015)"
If you have a Powder coating business nearby, ask if you could collect some of the over sprayed pieces on their frames. Make sure you use safety glasses, as when they come off, they can fly some distance.
I used to do maintenance work in a PC place and as someone said they can build up to several inches thick.
Kryn