Female led relationships discussion

Last night my beloved threw a curveball at me..and mentioned she was considering having a custom-made chastity device that would be as literal and inescapable as possible.. I don’t often go public with our relationship, but ive been hanging around for years, rubbing elbows with the D/s crowd for quite some time now..Im feeling right at home here. So my main question is: does anyone know a maker who can build a custom chastity? The one she’s really captivated by is steel and includes a urethral tube ..it uses screws in its construction. I think shes worried about whether my innovative skills and creative abilities are up to turning ordinary household items into tools..Ive crafted screwdrivers out of nails before..I’ve told her that simply following the rules would be enough, but she wants more proof since im often away from her reach and outside her direct line of sight. Ive only worn one device once in my life..for about 8 weeks continuously..it was chrome but the ring gave me a pretty nasty skin cut after a while…so we want to sidestep that problem.. I feel i could earn some brownie points if i make her job easier by finding someone who can do this..and Im open to suggestions..perhaps something extra added to an existing design to ensure it’s inescapable..I’d value any polite and thoughtful replies…