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I think of the Bm chord in a couple of different Keys. Mainly D and G, A and F# Minor. I would first practice making a 1st position Am chord using the pinky on the A note/2nd fret of the G string and get used to making that Am chord in that position. Strum it for awhile and then walk it a fret down(toward the guitar bridge 1 fret(B flat minor) and get used to playing the B.G.D and A strings. finger pick them for awhile using all 4 notes. Then slide that pinky led formation down 1 more fret to the B minor and get used to adding index finger to the D/2 fret.
I would also make the C#m on the 6th fret and the Dm/7th fret and the Em/9th fret.
Do that for a week or two until it is very comfortable. That would be something I would practice in my before practice practice, which is usually 10 -15 minutes before practice that I work on 1 or 2 things that I’m stuck on and all of my usual Barre chord walk downs, including this just explained Minor chord neck walk down, just to try to keep them comfortable to use.