Infiltration commandos are far too similar to regular commandos IMO. They just aren't interesting enough for a commander slot.
To make them a bit more different, does anyone know if they can be equipped with m1 garands when they pop out of the building? If so, it could be interesting to make them a perma 4 man squad, which specializes in longer range combat and recon. Perhaps give them an upgrade with 1x scoped enfield with a marksman ability/ crit and/or the ability to call artillery and have better sight range? They'd probably need the weapon slot restricted to 1 if this happened, at least with the enfield upgrade.
I don't believe the brits used M1 Garands in any number.