Hi, I'd be very interested in designing a vtuber for you to use! I myself have been dabbling in the sorts and have a bit of experience in rigging in live2d, example is my profile picture which is a character I also designed.
Here is my thread for more art examples. For a custom however, I am fine with working with the budget you have for a full body design. If you ever wish to add simple animations, that would be an additional cost we could discuss. :)
Thanks for looking!