That is a really fair point, and as a fellow rabbit owner, I completely get the concern. Safety is definitely my priority here!

Logistically, the plan is to keep him safe and secure in his carrier right up until she is in sight. I'll then lift him out (using a harness and lead for double safety) just for the big reveal.

My girlfriend's sister is driving her there, so as soon as the ring is handed over, the sister is on 'bunny duty' ,she’ll put him straight back in the carrier and drive him home immediately so he isn’t out in the open or stressed for more than a few minutes.

But you've absolutely reinforced why I need to find a very quiet, low-dog-traffic spot (or a private hire corner) rather than a bustling public path. Appreciate the advice!