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having the ability to include the message is a great idea, that way you can include a wallet you know is good and a link to a video on how to sweep precisely.
As I mentioned in another comment, in the future we can also probably pretty easily implement a "sweep" function within the app so users don't need to download additional software & also implement private key generation features as well. In the current build you need to bring your own private key + address key pairs.
Mainly just wanted to build a working prototype then start collecting feedback.
A part of the reason I've been hesitant on shipping any key/wallet generation features is because as stated in the readme, I'm not really "a dev". So I'd prefer to leave that part to the reputable apps. In time though, if the idea is embraced by the community then I can definitely see it being included.
IMO one of the cool things about the "physical Bitcoin" stuff is that you don't have to sweep it.
You can just spend by giving it to someone else. Especially if it's a $1-$20 token. The important thing is having the ability to sweep.
Additionally, if your concern is what app people use to sweep, you can include your own message on the token when minting so you can just put a link to your favorite wallet or sweep guide.
I can definitely make a video on how to sweep but right now, but everything is very early stages and it's been hard enough to get regular bitcoin users to not immediately dismiss the project.