I totally understand the sentiment, since YAGS Chris was very much intended to be a "drop in" character that you could easily see yourself as. It's can definitely be jarring to have to see him as a more defined person now, especially physically.
If I had a bigger budget, I'd do it. It just means changes not only to the sprite, but also the CGs, which are significant, so I can't make it happen at this point in time.
If you changed Chris' name in YAGS, you can carry over the name to ZAGS as long as you're playing on the same computer (PC, Mac, or Linux) as you played YAGS. That should already be working in the demo, as well.