Not surprisingly I think you should somehow work out a way to keep the black HAC with gold HW and get the black 30cm Birkin with PHW. To me they are absolutely totally different bags. I personally would wear them with different things, for different occasions, and yes, I would match my jewelry to the hardware as well! I also feel that a 32cm HAC has more in common with a 35 Birkin than with a 30, but maybe that's just me.
That being said, if do ultimately decide that you want to get rid of the black HAC you know who to call
That being said, if do ultimately decide that you want to get rid of the black HAC you know who to call