To be fair, the Matilda has the same on-road top speed as the KV2, so I don't think it would be that bad.
/edit
That's the Matilda 2, the Matilda 1's top speed is HALF that (13kmh/8mph). Wow, that's slow.
It was, however, only used in France as part of UKF forces, so in my suggested locations, it could be ignored (also only 140 built). The Matilda 2 was present in North Africa, and its slightly better top speed (26kmh/16mph) would be a bit better.
I was mostly kidding. But yeah, Matilda 1s were pretty slow. Offroad speed would be ~infantry pace I would imagine.