Hi there
Sorry your post was missed.
I do not think you will have any problems with creating a bad habit at BT. Your LO is usually an independent sleeper and he will most likely return to this the moment he can. You are totally right about this being a phase and once it passes he will go right back to his usual independent ways.
You can give him as much A time on the floor as possible which may help him with his new skill or pulling himself up, it is more helpful for LO to pull himself rather than you holding his hands or 'helping' him walk, so all you can do is provide floor time and opportunity (so as little time as possible in high chair, car seat, bouncers or other seats, pram etc).
You might find some physical exercise prior to BT to be useful, I think mine needed a chance to burn off the last of his energy before his night sleep. You might also find just a touch longer on his last A time might help to make him that bit extra tired and possibly less likely to pull up to stand quite so much at BT. You can always reduce the last A again after the phase if needed.
hope this helps.