offhand, I'd say there is a greater chance of making things worse than better. how bad is the rust? unless the piting is so bad that it's effecting the accurancy, , I would just clean it off - you say its surface rust? The table is integral to the accuracy of the machine don't remove material for appearance sake unless you are solving a mechanical problem.
If its so beat up that it does require resurfacing, I agree doing it on a large surface grinder is the way to go, with a bit of effort put into the set up such that the top will come out parallel to the dovetail - if the dovetail is flat!
if you are resurfacing the table on say a big surface grinder, support it by the dovetails but check for wear with an indcator - its maintaining the same distance from the dovertail surface to the table top the matters. Now chances are that dovetail wear isn't even so a proper job has you scraping the dovetail...can't fly on one wing, so now you're also scraping the mating dovetail. etc etc.
clean up the rust, run over the surface with a steel wool and then a broken file with the teeth ground down (to catch any dings and bruises) then check it out with an indicator to determine if there is a problem before cutting. if the is a problem, its more likely in the dovetail than table top. imo your restoration efforts would be better focused on bearing surfaces, screws, spindle, etc - the places where wear occurs.
Lapping would be the toughest way to do this imo, as it would be difficult to maintain the accuracy of the distance between the top and dovetail.