Wow, I was just playing around with the new version of nak by nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 , with it you can create your bunker in seconds to sign remotely on any client that supports nip-46. Just download the utility from the https://github.com/fiatjaf/nak repository, there you will find instructions on how to run it, once installed use the command `nak bunker --prompt-sec wss://<relay-url.com>` to start the bunker with the relay of your choice as coordinator, then once it has run it will ask you to set your nsec, after that you are all set to sign messages remotely using your own bunker!
I have recorded a short demo
https://media.nostr.build/av/1f14384e94665125e13524471899962d456c69114dc4f09d3c97dae0daf37300.webm