Don't you just use the rear-most shifter location on the TKO600, and bolt on the reversed handle?
Maybe I'm misinterpreting your intention....but using a Toploader shifter (Ford or Hurst) and adapting that to a TKO600 that already has an integral shifter would be like trying to reinvent the wheel
Cheers,
Glen
edit:
Here's the TKO600 config I'm talking about...
