Non anodized mast should not be an issue. Long ago all masts were that way until they had places that could anodize such long tubes. I replaced a mast on my O'Day 23 using non anodized to save $300. I just kept it waxed every year and it was fine. Non anodized will just oxidize faster unless treated as I did. End caps won't fit with the thicker wall but you could try measuring the current end caps and see if you have enough material to shave them down. Extra thickness will be heavier and as such would affect your righting moment, but your weight low on deck probably will mean you won't see a significant difference. That being said I would look around for used masts or new ones. I have new old stock masts in Rhode Island, bt shipping is difficult. You could go to www.uship.com ans see if anyone is willing to bring it to you because they are making the trip anyway.