Sure, ok... So what would be wrong in the simple fix of only take say one company per 3000 points? Make it Unique. Why not, it was done to the Wind Rider Host and the Squat Biker Guild... (to name but two off the top of my head.)
That way say if someone had spent a lot of money and time getting these models they wouldn't feel so frustrated that to play them they were paying too much or not able to take them at all due to better valued units available. Just think, Imperial Guard Armour in play... how novel. You may even get to play a Steel Fist army. What ever next... Guard with armour... tsk, where will the madness end.
Personally I have made two distinct designs.
The first has no change at all. It is the same crap tank we all avoid. However the cost is only 175 points per detachment and 500 points per Company. These are available to IG, TG and PDF. These models are the crap Mk I+II minis.
Then there is the Mk II, The Battle Cannon has been fitted with a better rangefinder/targeter combo, I don't know... someone found the STC plans for it under the Emperors bedpan or something. It now hits on a 4+. Amazingly bringing it into line with just about all the battle cannons that the Imperium have on other units... All other stats are the same, and quite right too. This now gives it the worth of 200 points per detachment and 600 per company. Available to IG and TG but only in detachments for PDF and not at all for Frateris Militia...
There, now tell me, am I being unreasonable?
Oi! Where did the Commissar go. Isn't there meant to be one PER IG Company or something? What no corresponding trade off for letting him go? No benefits? The Guard needs a union to help against these bad trades with management.

Solidarity brothers.