I think ive done it inthe past, but the first turn aroune the chain, or carabiner in this case. Can you do a crown, then proceed to splice? Instead of doing one strand on way thru, and the other two strands the opposite?
Participating at a forum is a big investment in time, people has to play with his "priorities".
On an other hand, I can see how it's intimidating to intervene when the members have a high level of skill, experience and knowledge. I was in this mood at the beginning.