Hi Javier, nice Koshirae.
The first thing that sprung to mind is the old saying, if it aint broke, don't fix it. I say this because even small variations in tsuba dimensions can have you messing around with seppa/habaki/tsuba (really shouldn't with a good one) to make it all fit good.
Difficult to see, but appears your sword has no need for a tsuba with hitsu-ana, so in that case, I would look for a tsuba with no hitsua-ana. That way, looks less cobbled together, in my humble opinion.
I like the tsuba you have picked out, just find something along the same lines, without hitsua-ana or plugged hitsu-ana.
Does not necessarily need to be waves, lots of options.
Just my thoughts, hope that helps
Best