I’ve made suggestions several times upthread on how this could be accomplished...with technology these days - it could be done mostly without a lot of human work. Beyond that, there are other options - for example, I’d there are only E+ seats left, hold BE assignments until the gate, and offer those seats to more valuable passengers - those on higher fares, with *A status, etc., and then fill BE pax in those seats that go empty. If the problem is so common - perhaps it’s time to re-evaluate E+ policy in general - maybe give them free to silver at booking or X days prior to departure vs. at check in, or at 50% discount in advance, or give them to *G in advance, or to non-elites booking Y/B/M fares, etc.

I’ll admit to being no expert in revenue management, and I get just filling the empty E+ seats with BE is the easiest thing to do, but I can’t imagine why the company wouldn’t want to do more to solve this problem. If one buys BE and gets E+, especially relatively often, it seems like greater incentive for these folks to buy BE again (while ignoring the offer to pay for an assignment in advance), when they really presumably want to sell more higher fares instead. And I can’t think of a better reason for a non-elite, particularly those buying W, V, Q, E, etc, to think that maybe it’s actually better value to just buy BE next time, especially if they are going to be checking a bag anyway.