I don’t see too much of a point of guiding RPG projectiles imo. They don’t exactly have good penetrative power and will add to the cost of firing each shot which defeats the purpose of using an RPG compared to an ATGM.
IR FnF isn’t too expensive, oh it is launched in RPG launcher but it extends out, so it’s much bigger, sth like 500mm pen. Cost unit is around $1000, much cheaper than normal ATGMs.