PICUS is pretty meaningless after you have your ATPL issued anyway.
It was only ever invented so that airline cadets could get their PIC time up for ATPL issue.
Hadn't really taken that on board to be honest, I also got my PIC time by instructing, but when I joined the airline just logged PICUS the same was everyone else was, and as the legal text suggests is acceptable.
Will still continue the split post-ATPL though, as it gives something to look back on and remember who was flying what, and as I said the electronic logbook does it for me anyway.