I would really buy one as a souvenir 
You are doing something similar like coldcard wallet, and that is NOT Open Source.
Don't make your own restricted code and put open source sticker on it, because you are deceiving customers like this.
It's even worse that you only planning to do that sometime in future, and I really don't understand why some hardware wallet manufacturers are scared of forking and potential contribution to their code.
It's a business and their ACE is the code. ColdCard put too much work to create the code that they have right now (they also copied others to be completely honest) and then The Passport wallet was creating using the ColdCard's open-source code. It's a commercial business, so it doesn't surprise me why they are scared.Don't make your own restricted code and put open source sticker on it, because you are deceiving customers like this.
It's even worse that you only planning to do that sometime in future, and I really don't understand why some hardware wallet manufacturers are scared of forking and potential contribution to their code.
This is my main grip (amongst others) with "wearable" cold wallet devices - once it gets mass marketed and known to the general audience, the user will have a mark on his/her back from ill intended individuals. I easily see users of the device being victims of the famous $5 wrench attack.
The society is not ready to flex with Bitcoin wallets. It depends on the country and neighborhood but overall, you are right, it's dangerous to wear this ring and walk outside if many people discover the existence of this ring, as it should be since the company wants to sell as many as possible.Closed source is "magic" and you can promise anything.
That's how people get fooled.