From what I see from a number of comments - there are variations with the Spanish and Portuguese Minhag between the key S&P kehillot - Amsterdam, London and New York. It may be a good and inexpensive exercise to document the differences in key areas. Because nobody can really can claim one authentic S&P Minhag. Also, as to suggestions raised in this group need money to facilitate them. Eg. To have an exclusive S&P yeshivah takes a lot of financial support. I am retiring from community Rabbanut in 6 weeks and perhaps I could co-ordinate such a project. But again I may not be the most qualified to do so, as I am just completing my last position - leading an Ashkenazi community!