But now I realize you are trying to replicate an exact recorded track. May I suggest that if you’re trying to “get it close to the organ part in a Wes Montgomery recording” and you’re “just aiming to use it for practice,” then perhaps BIAB is not the best tool for this purpose?
Attempting to use BIAB to absolutely faithfully reproduce a commercial track note-for-note is like trying to drive in a nail with a screw-driver. It’s not the best tool for that.
Anyway, since you are just wanting to practice with the track,
HERE (Play) is your track which I ran through RipX and told it to take out the guitar, which took less than 5 minutes.
Don't get me wrong, I think BIAB is absolutely fantastic for making tracks to practice to. But in your case it seems you want very specific duplication of a track, so in this instance perhaps you could do it better, or quicker, with other tools.