Yes 🙌 Just successfully did a test post from my test account. Once you have a key setup in nsecBunker, create a new token for that key. Then in Nostur choose add existing account and then paste the token from nsecBunker there to login.

nostr:note1rdmnpxq2vn35dudprrvjcweyj9my63j8shcy50vxjz7q0yykh7cq273z79

Should work like this:

https://nostur.com/v/nostur-add-nsecbunker.mp4