Great to hear but it's still the same shape. I really want a 'credit card' shaped version I can slide into my wallet.
You can buy a third party wallet card that works with the Find My network just like an AirTag.
I have a wallet with a pocket for an airtag.
I haven't stress tested it but I have a Spotfinder in my small wallet.
airtag compatible, shows up in Find My: https://nomadgoods.com/products/tracking-card
I like that it's the same shape. My backbag has an AirTag pocket, so I can just swap out a first-gen AirTag for a second-gen if I need to.
I think there are also several third-party wallet trackers that integrate with the Find My network.
I bought a third party one to do just that, and it's worked fine for me: https://chipolo.net/en-us/products/chipolo-card-spot
I think there are other options too