Not quite sure if this is the right place to mention it but I would assume that most people that want to post on a website or similar would find it quite sketchy if they would have to install and run an extra program.

Especially since you always hear that you shouldn’t install random programs because of malware and so on

Just a thought: why don’t you just use two different aliases for the Server in your .ssh/config with your two differing ssh keys, that way you can just use two different “hostnames” that have different ssh keys specified