1. I'd need to see the Digimon and here more about them first.
2. As we know about Digimon it is possible for them to hold multiple lines. However, I think It'd be best to stick to some likes that are already given to us. For example, I wouldn't want lobomon used because I may or may not introduce something like the legendary warriors into this. Still I'm sure later on I can link you to one of te sites I use to show various digivolutions for Digimon.
3. While I'm not opposed to it I would need to see te Digimon and here more about them. I mean technically when you think about it, wasn't guilmon a "fan made" Digimon. I mean he was drawn and made really xD.