This was likely mentioned before, but the perk price would have to be equal, if not higher, than the 262 for 1 plane in the MA. Maybe 300-500 perks per plane? Using the high end, 1500 perks to up a formation. Not like it would be a problem for a lot of folks. If the B-29 was added today, I would propose a wipe of perk points. The problem with that is, it will chase away a lot of players. As I saw mentioned in earlier posts, a lot of players are there for the furballing, mission/base hording type of style. Having to lose their perk points just so a few folks could have the B-29, wouldn't do well for HTC.
oakranger
Currently, the IJAC line up is lacking the planes to properly intercept the B-29. So until they are added, even in scenarios, the B-29 would be a broken plane. The exception to this is if the staff put a alt cap on them, maybe 20-25k. Then, it's possible for them being useful in the scenario's with current IJAC line up. "You fly higher than this, and your side is heavily penalized.", kind of thing. Not sure how they would keep track of the altitude's though. It would probably come in the form of screen shots from the IJ fliers, but this would be after the fact. Maybe putting a harsher penalty into it, would compel people to stick to the alt restrictions. "In also incurring a heavy penalty to your side, the squad assigned to the B-29 breaking this alt cap, will not be allowed to fly the B-29 in the next scenario and/or not allowed to participate in the next scenario. If found to be repeating-ly, breaking this rule, the squad in question, will be banned from attending Special Events.". This would mean that a squad would need to be sure of the people they are using, are very trust worthy.
But I already see a problem with what I said. You can never be 100% sure about new squad mates, which in turn, might prevent you from taking them along for a B-29 mission. They, in turn, might despise the squad for not allowing them to join for a B-29 mission. However, the penalty for a person on a squad, shooting down a bunch of allied planes (whether he's stupid/new and doesn't know better/intentionally), is heavy on the squad that person flew with. So maybe it isn't too harsh of a penalty?