6 Lug on Camaro Clip

[Red Foreman]

I have a 56 GMC that I'm clipping with a 77 firebird chassis. My problem is I would like to keep the truck 6 Lug. I have access to a cnc machine but the hub face on the 11" rotor is not large enough to take the larger bolt pattern. Is there a rotor I can mount with a larger hub face that can be drilled to 6lug? even if I had to trim the total diameter to make it fit the 11" spindles?

I had an idea of mounting 12" spindle/rotor/calipers of a late 70s 80s even early 90s full size GM B/C body. Assuming the hub face is large enough to redrill or maybe a 6 Lug rotor that will fit straight on?

I Live in Melbourne Australia, I dont have the luxury of going to a local wrecker or pull apart & collect bits to try out. Almost everything second hand of a US vehicle, I need to have to imported. Any imput would be greatly appreciated, I'm keen to buy the bits I need & have them shipped out!