Higher stall torque converter with large bolt pattern?

Hi!

I have a cast crank 440 that has been balanced with large bolt pattern flex plate. Weights have been welded to flexplate. Problem is that all the aftermarket higher stall converters seems to have 10 inch bolt pattern. Do you know , are there higher stall converters for sale for large bolt pattern flexplate? Maybe 2500rpm stall

One solution would be to drill new holes for the 10inch bolt pattern TC , that I have on stock...;)

Engine is gonna be mild 440 with 10.0cr, ported 906 heads, purple cam 284/284 with 0.484 lift