Vehicle-wise?
Hunter, Sherpa Armoured Truck (Vandenburg Mechanised Industries, Vandenburg)
Plainsman (Pinard Protectorates Ltd, Pinard)
J. Edgar, Fulcrum (Alphard Trading Corporation/Pinard Protectorates Ltd, Perdition)
For reasons why not, as stated in the other thread, the Rommel/Patton was a new-built, fusion-powered vehicle from the other side human-occupied space. It was a pretty big deal even for the Lyrans to be designing a vehicle like that, let alone having it be copied elsewhere, not just in the Concordat.
Aside from the technological issues, there is the issue of legalities to consider. Although theoretically anyone can just tell companies where to go and what to do when they get there if they object to the construction of their designs by other powers, this is very definitely not the norm in BT. The Concordat was already exceptional in its manufacture of other war machines without the appropriate liscensure to do so.
As to whether it's a good fit... maybe, maybe not. The Taurian Concordat lacks the DropShip and JumpShip assets necessary to be an effective offensive force, so a high-tech machine with one A/C-20 is not really something I would put a premium on. If it were me, I would either go with established alternatives (Bulldog, Hetzer, etc) or try to put the Demolisher into production. Another viable alternative would be something like the Axel (Rommel ICE clone) or, preferably, the design of a new 75-ton 3/5 MBT with an ICE and an armament based around the A/C-10 suitable for both city fighting and general engagements.
Just to quickly throw it together, Engine (20), Internal Structure (7.5) Control Systems (4), Armour (12), A/C-10 with 2 tons of ammo (14), 2 LRM-10s with 2 tons of ammo (12), 4 Machine Guns with 1 ton of ammo (3), and a turret capable of holding the A/C-10, LRMs, and 2 MGs would be a solid counter to other heavy tanks of the Succession Wars era, if a little slower. There's even room to make a city-fighting variant that swaps the LRMs for SRM-6s and a 4-ton Infantry compartment if you want a dedicated urban brawler. Later on, you can upgrade it with an LB-10X, Ferro-Fibrous, and Artemis. Pretty solid machine, IMO.