Been through this before.... You have to ask yourself this question. Is a $100 to $150 fish worth putting in danger a few thousand dollars worth of coral.
I can tell you through experience, the only angel that will not nip at your LPS and Softies are SwallowTails, and similar genicanthus angels....
Regals, Majesties, Blue Lines Ect Ect will eventually taste, nip or destroy your reef.
I have had all of the above and had to learn the hard way....With my setups they slowly over time would destroy my corals... Wouldn't be any one coral.... One day the regal would nip at a clam, other days Open brains, other days Lobos, Pluck Zoos....
People that post on here that say they have such angels I truly believe they are looking at small windows of time with minimal damage... Ask them 2 years of time with Angels and I guarantee you they have FOWL tanks.... Period... Maybe SPS tanks can sustain them.... But not LPS or Less...
It's really funny. Saying keeping a fish well fed means you need to over feed your tank to keep this fish happy. You claim to have SPS... SPS need pristine water quality... Why over feed an Angel at the expense of your SPS... I suppose if you plan on doing 4 water per month and have a super skimmer you could counter act it??? That has also led me to have awful water over the years... Over feed a fish, get bad water, and then corals die from bad water parameters... (Another issue all together).
Look at the pic of my Avatar... One of my favorite fish I ever owned... Red Sea yellow belly... He womped my reef over time.....
I say this with tons of respect...
And I say this to you. You probably truly want this fish and your mind is made up. You probably need to try, learn, and have the same experiences we all have had with Angels...