The P-frame clamp is 41mm diameter for Alu whlie K-frame clamp is 40mm for steel, so you have to see if it will fit on your bike.

The bracket on the P type doesn't even fit any of the Shimano derailleurs I tested. For some reason, Litepro made the lower part angle backwards, and it hits the swing arm. Really bad design. I don't know, but perhaps you could test SRAM derailleurs. Photos I've seen seem to show the swing arm further back, so it may clear the P bracket.

Next time if you want a P clamp, you should ask the seller to switch for a K bracket.

You don't need to program a 3D printer, you only have to make the model and upload it to the printing companies. I did my metal printing with Shapeways.com

I first tested it with my own small FDM ABS printer to test different shapes, positions, and angles. Then I ordered a stronger nylon print from Shapeways. After a few modifications, I ordered the final metal print.