I'd be happy to learn more about it, if you have a source. Every time I try to find out more, I read that the PGA Tour is a non-profit membership organization. Perhaps someone can clue me in as to who the real "owners" of the tour are.
My PW is 46 degrees too and I play a 50,54,60 and love it. I have gotten really good with knocking down my 54 degree and have feels of swing length and where I grip on the club that give me 5 yd increments dialed in from 85-115 yards.
I have roughly a 7-10 yard gap between full swings on PW and 50, but I rarely hit those full, usually knocking them down a bit too.
Long winded answer to say that either way you will still have a 6 degree gap, but it's up to you if you want it to be between your PW and GW, or SW and LW.
I'm not really familiar with those details, but I know @iacas is, he has been doing course ratings for a number of years. I do know that ratings are done following USGA procedures, but that the teams are organized and assigned by the State or Regional Golf Associations. I'm not sure if Argentina has subdivided into smaller groups like we have, for you it might be the national association that does it all.