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The thing that struck me about those when I was looking them is that there aren't actually any pictures of them on people's ears in all the marketing bumpf. When I looked at them in person they were bigger than I expected so I'd have a look at them first.
The Sennheiser Momentum on-ear fold up small-ish but not really small, needs a decent sized coat pocket
My favoured small, BT headphones are these https://www.whathifi.com/sennheiser/pxc-310-bt/review but you have to get them second-hand now (I like them so much that I've stocked up on multiple pairs from ebay).
Alternatively you can get one of these and just use your current headphones (although still some wires) https://www.amazon.co.uk/FiiO-Bluetooth-Receiver-Built-Support/dp/B07D8K76F4
So I am thinking of going for the AKG on ear bluetooth. I register that there is little love for AKG on here, but I am so happy with the neat foldability of my non-BT AKGs that I would be hard pressed to go for something more substantial, i.e. something I could't slip into my jacket pocket.
However, before I drop my dosh on these, are there other very packable/portable bluetooth headphones I should know about? I potentially have a larger budget than what the AKGs cost.
EDIT: Perhaps these instead actually. Not tried them on tho'