25-06,
I don't know if counterproductive would be the right word. I don't think that it can hurt to know both rectical hold over and clicking, or to have both at your disposal.
I also don't think that you'd have any problem figuring the recticle hold over game out.
However, the TMR lines are in mil's, while your scope clicks are in MOA, so it wouldn't be quite as easy as, say, a NP-R2 where your holdover lines are in MOA as well, and one MOA drop chart can be applied either to your knobs or recticle.
Also, the TMR is a 200 buck conversion, while a "Standard Recticle", which may include the fine duplex, is $55.
I'd say give the custom shop a call and see what they can do, I was happy with the turrets they put on for me.
Good luck,
Carl