Yea, I knew that Braze was to hard solder with brass & Braise was a method of cooking, but just followed along anyway.
Personally I would want my doubles Rust Blued regardless of joining method. I also recall Brownell's claiming the lead free Force 44 soft solder they sell/sold, not sure of current status, would withstand hot salt bluing, though I have not personally tried it. It was predominately Tin with a touch of Silver as I recall.
I do recall Oscar saying the alkaline salts attacked the tin, but I had always heard it attacked the lead, so not positive, but I prefer rust bluing anyway, so matters not much to me. I do know they will eat up aluminum in short order.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra