To add to what has been said, the reason why most people will not do an OMEGA trim commission is the sheer amount of time it takes to prepare one. With the extra cost of parts ($80 AVE-HDMI) and the many, many more hours needed to prepare the trim (compared to an OMGWTF or even an LMAO), the price to justify the labor would most likely drive away whoever wants to buy it. As a reference, when I was doing OMGWTF commissions, I charged $100 for the trim. Anyone who values their time would likely end up charging probably $300+, maybe more, who knows.
Also, there are only a select few people around here who have proven themselves with OMEGA trims. I would be extremely weary of who I would pick to take on this commission. You don't want to go with someone with little experience just because they say they "can" do it.
Anyway, long story longer, take what I've put here into consideration. If you are unable to do the OMEGA trim, the rest of the project is likely not going to go so well. You need to really understand the Wii's anatomy for a successful build.