This is different. It’s a EU gov app that gives your website a zero-knowledge proof of age. Basically the only info they get is a “yes” or maybe the age itself. This is much better than what you describe, but I’m not familiar with the way the UK system works today.

I found this: The EU launches an online age verification app. Pilot project in five Member States (including Italy)

That’s a breaking change!

If you have a homelab server chances are you are able to run a VM with remote access. If that’s the case then you can use the MacBook as a thin client for remote access.