I'm thinking of a HBAR Lewis MG in lieu of the Hotchkiss with an armored external jacket. Or maybe even a pair with a left hand eject model that are mounted sideways with the pans on the side.
Sounds like putting Reibel machine guns in, before these have been invented two decades in the future.
A twin mount I doubt fits the small turret. Look:
The Ft is tiny
Considering Tankovia is going most probabaly to buy these on the surplus market (although France kept manufacturing them I think) Tankovia Tank Regiment No. 1 may be stuck with Hotchkiss in 8*51 mmR and Puteaux 37 mm cannons. But then I would only buy like a dozen or two and see what this newfangled "tank" thing is all about. The rhomboids are instantly obsolete with the end of the war, and where should Tankovia park these landships? The British Mediums would be interesting, but manufacture stopped with the armistice. The FT is still slow, weakly armoured, weakly armed and has problems driving up and down mountains and it is clear that automotive technology is going to improve in the next decade or two. It is clear the FT will quickly be overtaken. So IMHO the FT only is fit as a trials vehicle to test the concept of tank.
Maybe Tankovia can get ahold of some LK II, that the swedish did not smuggle out of Germany? It is bigger with more growth potential.
What about armoured cars?
Or... armoured trains?