Let me get his right you are comparing the BP1, BP2, BP3 cost with AT grenade Molotov cost?
In the end of the day the idea here is ostruppen viable during at end of the game not solve the conscripts problem.
Making ostroppen conscripts but cheaper and better supported and batter armed would certainly make them more viable but regardless of timing it's a matter of bloody balance. It's bad enough that OKW shit on the face of Conscripts with Volks for only 10mp more but you want to give to Ost the chance to do the same but cheaper?
Their viability is their uniquely durable and cheapness in a faction with expensive and squishy units. They just got a bloody lmg given to them for late game scaling if that's not enough for engineer priced troop then idk what. They are exclusively for holding ground effeciently and manning weapons and they do that EXCEEDINGLY well, probably better pound for pound than anybody. They don't need added utility on top of being able to build a multitude of cover and Bunkers and have a snare too.
They have a defined role that they fill and is not supported by all playstyles they are unique and fill a niche which is what call in infantry should do.
Being able to effectively hold ground while supported by powerful team weapons and then transition into lmg defensive infantry AND durable ground grabbing troops that can merge into the likes of pgrens and grens is Ludacris to even think of from a balance perspective as these are units that are balanced around not staying on field to dish out damage for long and thus do so effeciently. Being able to top them up in an instant would be game breaking. Not to mention that a 6 man squad COULD top up 2 whole 1 man Ost squads. You would lose the squad but depending on the squads it could be very worth it. (50mp premium for on field and instant reinforcement of 2 gren squads? Yes please! Let alone pgrens...)