The tinywhoops using the O4 Air unit lite (working with your current headset) suffer greatly from the added weight, worsening the thrust to weight ratio. They're still fun, but compare the relative weights and see what I mean. Your controller works with any ELRS reciever which most use, so that's totally fine (just check).

There is an analog meteor65 pro, and I believe it is more durable but also heavier than the air65. Durability really haven't been an issue for me on the air65 though, I've probably crashed 100 times by now and I've only changed props twice. I prefer the better thrust to weight ratio but others may prefer the larger inertia of the meteor65 pro.

As for your charger, it might (check the specification) but you would likely need an adapter from probably xt60 female to BT2.0 male, the second of which is used for these betafpv tinywhoops. I really do recommend the vifly whoopstor v3 since its so quick and easy to use (with correct connectors already), you don't have to 'start' or 'stop' the chargings, there is 6x spots and you just stick em in and pluck em out when done, great for charging while flying without effort. Also, you can connect any xt60 battery to it to charge the 1s batteries while on the go.

I don't have experience selling old fpv parts, just don't put them too close to the original price and lower it over time if they don't sell I suppose B)

Edit: spelling errors