Slat armour would be difficult to cast in resin, if the thinner pieces on Spectre's vehicle kits are anything to go by. Which leaves spaced armour - which wouldn't be difficult to make yourself - , or stuff like ERA - which IIRC Special Artizan Service Miniatures are considering doing a set of.
A set of spaced armour if made would likely sell, though slat armour would be more ubiquitous for militaries and more likely to sell. A kit to turn the vehicle into a BMP-2D (once the BMP-2 is released) would be nice, if they don't make it one of those by default to differentiate it from this original kit.