Who to contact about shifter modifications

I'm going to be running a manual valve bodied 4R70W. The only after market shifter I can find is a B&M Hammer shifter which I don't plan on running. I also don't plan on using the stock shifter mount location. I'll place the shifter about where the emergency brake handle use to be located.

I'd like to use a shifter like or similar to a B&M Pro Stick Composite X, Hard Core Street Bandit, or Magnum Grip Street bandit, the problem is they don't make them for an aode or 4R70W.

Two questions:

Which shifter similar to the ones I listed, could I "make" work for my tranny? ...or

Who can I contact to modify a shifter I like to work with my tranny?
 
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