I've also seen beans that have both the regular pattern and the reverse pattern on the same bean. It is usually one side that has one of the patterns, while the other side has mostly the other pattern with a bit of the first pattern showing.
And, on all of reverse colored seeds that I've seen...
Under the terms and rules (Don'ts #9), it appears that linking to another "similar " site is objectionable.
Perhaps using PMs is OK? To not step on any toes, here, I'd just give out my email address, and any discussion would take place there. If I had time, I'd supply all info, here. But, again...
I host a fairly large seed swap. If it's OK with moderators, I will post a link to it. For now, I have to fulfill current participants wish lists. I figure that by early January, others can join.
And, I think you snuck away from me. I don't remember if I ever sent you those Asian beans that you requested, this year. After I update my "trade/give away" list, I'll see if anyone would like to trade, here.