If you need a lightweight bass there seems to be some nice options out there these days. If I had the need and money I would speak to Shuker and get him to make something nice and light. I have crap eyesight due to various things and wear glasses when gigging. It`s a bit of a rubbish look in a rock band but as I can`t wear contact lenses, glasses it is.
In fact the one time I played without glasses, I couldn`t see the set list and a few comments were made that I was getting vain in my old age
In other words, do what can to make the gig easy. Good luck!