I use a local and private Dendrite (Matrix) server to exchange strings between computers through an encrypted chat to myself.
No installation, instant access, have multiple users and keys per browser(profile).
Easily generate one off accounts.
This is a gloriously good idea.
So long as it works...
i mean, you might have better client os support than a matrix client in most cases :) and if you are running a private matrix node you already have sshd to solve all the constant annoyances and upgrades
I’m also not aware of those constant annoyances and upgrades.