Shadowcrystal save with snowgrave?

Hi, I have a neutral save and a snowgrave save, but I don't have a save for getting shadowcrystals (where i kill everything i come across + secret bosses).

If i were to do a shadowcrystal save, would it be a good idea to do snowgrave on this one as well? Or should i separate snowgrave route in one save with getting all the shadowcrystals in another save

I guess this is a question focused on how the future of the game will play out, so Im kinda just wondering what your guys' opinions on what i should do rather than a factual answer.