Yeah, both of the main modders here are going to be away for a while unfortunately - probably for at least another month or so. However, if you really want it done immediately, which is understandable, there are more commercial avenues. One such place is
www.oldschoolger.ca or OSG, though I just tried going to that site right now and Firefox has it flagged as an "ATTACK SITE".
Some third party may have infected it will malware or something, but they are legitimate. Hopefully they get their site fixed up soon. Anyway, they're a little more expensive than getting someone from here to do the work, but they're not terribly expensive.
OSG, however, and at least not when I inquired back in January, does not do the S-Video mod for the Duo. They will do the region mod, A/V mod, and the sound fix. I think they quoted me around $140 for the whole thing including shipping...IIRC.
...just weird that their site has been infected.