I also have a DTSE9 and it’s been on my keychain for at least 10 years now :D

Recently I have just gotten 2 nvme ssd enclosures and have been very happily using them for the super quick image writes. I just checked if there’s some compact 2230 enclosures and some of those even have keychain attachment points… they definitely are a bit bulky for a keychain but I’d argue they still are an option and will look similar to a keyfob :)

Glad I took the time to comment ☺️

On Linux I use https://github.com/WoeUSB/WoeUSB to create windows flash drives… works uhh most of the time? :D In case you hadn’t heard of it :)