"In Soviet service, the Valentine was used from the Battle of Moscow until the end of the war, mainly in the second line. Although criticised for its low speed and weak gun, the Valentine was liked due to its small size, reliability and good armour protection. Soviet Supreme Command asked for its production until the end of the war (...) Red Army received 2,124 British-built and 1,208 Canadian-built Lend-Lease tanks. 270 and 180 lost during transportation" (wiki)
I'd feel it could be a great t-70 alternative with more aura, vehicle commander abilities than raw performance of t-70. I wouldn't buff the armour though. It was probably the most numerous tank delivered via lend-lease to USSR and it would be nice to have it in one of the commanders.
But to the topic. Maybe a good idea would be build those half-track from one of the structures and call in just guards. Generally, I feel the ability to build, rather than call-in vehicles with troops might be a better option in general, especially if such troops cannot be bought separately. You could just call in guards and build the halftrack. You could have more of such infantry units this way, without the need to have a few halftracks instead of one.
The reason why the main gun was considered weak is that the British ignored the HE shells for their guns. And even when the 57-mm gun appeared, the British did not produce high-explosive shells. Deliveries of 57-mm high-explosive shells did not start until March 1944. And the tankers themselves installed an additional 30 mm armor on the lower frontal part and on the frontal one near the driver’s sight. Armor was installed on all modifications of the Valentine tank. For example:
Valentines with full extra armor:
And Valentine with just the lower frontal part:
About the game: I think Commander Valentine is an interesting alternate M4C. The question is what should be the commander's tank: Should he give an aura? To whom? Tanks, infantry or all together? Or another kind of commander’s tank - it will have air reconnaissance and artillery strike, for an alternative waste of ammunition. After all, in a very large option, a fuel plane is simply shot down and you accumulate ammunition that you can’t spend.
About the Guards - the ability to purchase them separately should be required. For the game I need two squads of Guard and one squad of Conscript for support. I called two Guard units. Okay, I’ll use one M5 as M17 or as a reinforcement. The second M5 is unnecessary to me. I have lost one unit and I call one more Guard. And get third M5, two of which I do not need, spend foolishly on fuel.