I am in the process of doing the exact same thing. My mast was about 2 ft out and inline with the saloon door, making it impossible to manoeuver furniture through the door. (I had to take out a window to get my recliner in. The side stays were also a pain to duck under when on the flyingbridge As the mast was stepped to the keel I had to patch both the deck and flyingbridge. I bought one of those "radar arch in a box" from Atlantic Towers as they are one size fits all and are hinged. You only have to lower the arch a couple feet to get it level with the bimini top. As I had radar, VHF/AIS, GPS, anchor light etc to rewire, this made the reroute of the wires easy. Unfortunately, they sent the wrong size arch so am waiting for the new one that is now due Friday. The radar should not be a concern as in my opinion (here come the flack....).
My mast was painted aluminum and the arch is polished aluminum. I did put the short (wrong arch) up just to see how it looks and was pretty happy. They have plenty pictures on their website. Total cost for arch $1700, fiberglass and paint $200. HOWEVER....the patch looks so good, the boss wants the rest of the back deck redone to match. My offer to scuff up the patch is apparently not acceptable alternative