Grinslade has a picture of a New England fowler with ivory RR pipes and side plate. However, if you make a bone side plate, you can expect Mike to complain. Been there. Done that.
As far as your nose cap goes, I sincerely doubt that we can think of anything to do to a flintlock that hasn't already been done. If it appeals to you, do it. I think it might look nice in a few years after the whiteness has mellowed out some.