that is much as a argument as for the p4 (ostwind and stug)
it already has the best AT of all medium tanks (50% reload at vet 3, best pen profile with high pen at all ranges, commander give extra accuracy and sight)
i would prefer a little buff to the mg too, to kill stranglers when u hit them with the 75mm
It's not quite the same because OST has the StuG.
If OST goes for an Ostwind, it can get a StuG to support it. UKF doesn't have that sort of cheap AT tank to support the Centaur unless it goes for Lend Lease Assault Regiment.
That leaves the Centaur reliant on anti-tank guns for AT support, which heavily limits its mobility. That means the Centaur needs a hefty AI advantage over the Cromwell to make that sacrifice worth it.
That's currently achieved by the Cromwell having trashy anti-infantry. If you buff the Cromwell's anti-infantry ability, you risk rendering the Centaur off-meta to obsolete.
Hence my suggestion to buff the Cromwell's AT instead, filling the midrange anti-tank role UKF currently lacks.
You could also just slash the price on the Cromwell.