I think the Mesa Subway 115 uses the Faital neo driver... not 100% sure but I think that's correct. I have one and absolutely love it. It has become my #1 cab, and I look forward to adding some brothersand sisters for it as well.
I won't say it is "scooped", however. Actually, I think for a 115 it provides more in the upper-mid department than one might traditionally expect. Not so say that it's "middy" at all, but that it is much more accurate than 115s of yore. It will give you back whatever you send it. To me, that is actually more "modern" than a scooped profile, but opinions and elbows, amirite? Haha! A tweak of the EQ knobs on your amp or bass will scoop whatever you don't want, and the cab will faithfully oblige.
Anywho, I didn't read all the backstory here, but if you haven't tried a Subway 115, I think you may be pleasantly surprised with the tone, and I KNOW you'll be happy with the light weight! The price is the only downside, and though I was hesitant to buy at first, I am happy that I did. No ragerts!
edit to add: I just realized that maybe you meant you wanted to just swap out the driver, not buy a cab designed with the speakers you mentioned... hm... in that case, I don't know. Maybe AgedHorse will see this and advise if the newer Faital will work well in your existing powerhouse cab. I have a feeling it may not be ideal.