Ok....so the only reason I did this is I have two pairs, I actually like the aged sole
Disclaimer....I have NO IDEA WHAT I'M DOING or about the long term effect on the suede, it might lose colour or rot in a few weeks

you will have to treat this post as a board middle aged man rummaging around in his wife's make up draw looking for something to do!
I ran out of the boots nail polish remover with the first shoe so I had to go into town (the boots stuff was probably 3x more affective than the co-op's) first shoe took about 15 mins the second one I have given up on until I can get more of the boots stuff.
1.Cleaned the area with Jason Marxx.
2.Dyed it with a hand towel.
3.Loaded up the ear bud with the varnish remover.
4.Tested the suede in a discreet area.
5.Applied it to the painted sole.
6.Rubbed with the hand towel - repeated steps 5 and 6 until area clear.
7.Cleaned again with Jason Marxx (other detergents are available).
8.Patted dry with the towel.
May need to get a toothbrush involved for a perfect finish.
Peace!