Yes, not much luck in getting people to transfer to GEDmatch or FTDNA.

I expanded the idea of adding Gedmatch kit numbers. My profile has my kit numbers as the picture and I added kit numbers for my maternal and paternal cousins. When I get to my grandparents, my maternal grandparents have my kit number and my maternal first cousin's. My paternal grandparents have my first and second paternal cousins as well as mine. As I go back in my tree, I add my Ancestry, 23andme and Gedmatch matches for each ancestor so each generation back has more kit numbers and user names. I have just recently started this so it is a work in progress.

I also add unattached trees for matches that I cannot yet connect with and add the Gedmatch kit numbers not only as a picture, but add it to the name of the person tested. I am hoping the ancestry search engines will pick it up when you type Gedmatch into a search.