I think we've got like a 110mm bore, so that's going to be your biggest stumbling block. If you decide to go with anything smaller you need to figure in the cost of a machine shop enlarging the hole. Just a little bit you can do yourself, like the .5mm I mentioned earlier. Beyond that and you're asking for spontaneous wheel failure if the material can be removed at all.

Try and make conversation with a Titan/Armada owner and ask to trial fit one of their wheels. That's what I did. Just struck up a conversation and offered a guy $5 to let him watch me pull one of his front wheels off and try it on my VX. After it was all said and done he even declined the $5 and I knew that I liked the Frontier wheels better. Got an entire set of 4, brand new, delivered for less than $200 thanks to eBay (note the center sizes):