Wilbur has an export to SVG feature that saves a little aggravation for the lazier among us. A little blur before export smooths things out to get more rounded landforms.

Wilbur also has a grayscale sea mask shader that will give you a black and white land/sea mask directly (you can do the same thing in FT by setting high and low land colors to white and high and low sea colors to black).

Wilbur 1.66 does seem to have a small problem with horizontal direction swaps on the SVG output, but I expect that to be sorted out soonish.