I wondered about that as well, I remember folk did it with old Tonti models.
I was told one problem is if a plug or one coil fails the cylinder is then running retarded with possible overheating and piston and exhaust header damage. You don't know the plug has failed, as the drop in performance will not be great, until you see the header glowing cherry red.
68C's post in 2006 breva head compatible with v11 ? was marked as the answer