904-727 swap Torque converters...

so heres the deal, i have an 88 d150, just got a replacement internally balanced 318. Also since the the old torque converter grenaded its pilot shaft the tranny was shot, so, A727 goes in.
I am aware i have to get the driveshaft shortened as the 727 output end is slightly longer, but the real issue i am having is finding a torque converter with a 12” ring gear for the starter.

No problem finding the 11” option, got a yoke no problem, but that elusive 12” ring gear has halted my project until i can find a solution.
If budget weren't an issue, then sure i could get one, but it seems insane to me to pay more for the damn converter than the whole new transmission...

IDEAS? SUGGESTIONS?