Give Helix a try. It comes with everything you are asking for built in, plus discovery for the commands, plus a selection first approach so you can see what you’re doing.

1. Yes, Helix is a fully keyboard based editor. It does have some minor mouse support available but it is an afterthought.
2. Nope! While the key map of Helix is fully configurable and by default similar to vi, it uses a select-verb grammar instead of a verb-select grammar.

Systemd has been a complete, utter, unmitigated success.