What service do you use? Been thinking about doing the same sort of thing.

This is great. Thank you for sharing

I use Privacy on a rare basis. It doesn't require a browser plugin, you can just log into their site and copy/paste the information.

It is worth it for me as I use it to sign up for "free" trials that require credit cards and then I don't have to worry about getting charged.

A note about credit cards, if you have a history of payments with a company, that company can ask the issuer for an updated number after you get a new card number. If it works then they just store the updated number and keep up the subscription.

They won't use it until they are forced to 100%. iMessage has become a reason people get iphones. Peer pressure at its finest.

You should also put your efforts towards getting apple on RCS. Then you wouldn't need to have multiple apps.

I have the Lily58 with low profile switches. I can travel with that very easily. Takes up about the same amount of space as my kindle with a case and keeps me typing happily.

I built mine for around $300USD.

Do you have any old hardware that doesn't have a job? That is a great place to start. Take some time try out different solutions (proxmox, unraid, casa OS). Then as you nail down your needs you can better pick hardware.