What BA need to do it to add an option/dropdown to let the user chose to credit the TP's to the person footing the bill.

They already have a mandatory dropdown to select who is paying for the BAH booking.

If they add an option at the payment page to either split TPs equally or post to the account of the person actually footing the bill, then that would make it much more attractive. If a couple typically travels together, it would be sufficing for one of them to get to OWS for the other to use the status benefits when travelling together, even if Blue member.

Under the old scheme, it would make no sense to do that but the new system is spend based, so it is only fair to the person paying for everyone on the BAH booking to get have a choice.