Specialized Transition seat post adjuster help needed

Unless I am incorrect, the two posts are not interchangeable.

Also, the only way to physically change the range on the forward position would be to get a different saddle that allows you more range.  I would be very apprehensive about trying to fabricate something.

And finally.  If you need that much adjustment in your saddle position to get forward, then your frame top tube is too long and the bike is probably too big for the application you want to put it in.

I would be leery of anyone fabricating anything. You are not only putting yourself in danger but possibly others.

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Thanks for the input.

My application would require saddle rails that extend behind the rear end of the saddle; I have never seen any like this but they do exist?  This is why I thought about fabricating a bracket or adapter.

I was thinking about an aluminum bracket/adapter that would bolt to the top of the stock seat post and then the stock saddle brackets would then attach to it.  Designing and fabricating one-of-a-kind parts is something that I did for many years in my previous job and is something that I am quite comfortable doing.

The goal of the experiment is to move the front tip of the seat forward of the bottom bracket rotational axis.  The existing top tube length seems appropriate for the current seat position (seat tip in line with bottom bracket rotational axis).  However, as you suggested, the frame may not fit me as well when the seat is positioned more forward of the bottom bracket rotational axis.  However, purchasing a different bike/frame is not really a feasible option at this time for the experiment while a bracket/adapter would be doable. 

Thanks for the input.  Designing and fabricating one-of-a-kind parts though, used with machinery up to 500 hp, is something that I have done for years with success.