(For example I don't do any costum things, because I did a lot back then and nearly none of this projects is still alive. It's just one of the most ungrateful things you can do, only one person could use the stuff you do and in most cases they even don't because the project is cancelled.)
It's a lot of work you want to be done for you.
You have the sprites and they work. It would be much easier if you just ask for one or two that really need a makeover and keep the others. The more you want the less you'll get done.
But: You said, you use the character generator. There are a lot of possibilities of expanding the generator, maybe this helps you to get nearer to the result you are saerching for:
http://umidoriya.tyanoyu.net/cb.html has parts under "
RTPジェネレータ化素材NEW!!"
There's also the famitsu generator, I think it includes other stuff than the one included in ace (but I'm not sure about that):
http://www.famitsu.com/freegame/tool/chibi/index2.html
http://www.famitsu.com/freegame/tool/chibi/index1.html
There are even more somewhere out there.
http://blog.rpgmakertimes.info/tools-utilities/rmvx-tools/character-creator-studio-rmvx/#.VFwhtskxiPo
There is this tool, even giving you a matching bust:
http://tkool.rgr.jp/maker
Think smaller. I mean, it's not just this, with all your requests you are asking for dozens of hours of costum work just for you.