I wish you nothing but the best of luck with your attempt, but I fear you are doomed to disappointment. To my knowledge, the only two creation scientists who regularly participate in on-line discussion forums are William Dembski (ARN) and possibly Jonathan Sarfati (TheologyWeb). I have heard of no case where one of the luminaries has appeared on a "hostile" or even neutral forum. Generally, I think the response you will receive - with some justification, I think - (if you get one at all) is that they are too busy to be bothered. After all, these folks make their living doing this. Why should they waste their time for free?
It's unfortunate that creationists tend to be swamped on evcforum fairly quickly after appearing. Look at this thread as an example. However, it is the nature of on-line fora, and Percy's activity or inactivity would probably have little impact on the content or participants here. Truth is, this forum is substantially MORE even-handed than most of the ilk you'll find on the web. A hint if you're interested in long participation here: you'll find that the majority of evos respond almost exactly in the fashion in which
you approach them. Come on strong or "preachy", you'll get slammed. Come on with bald assertions, you'll see demands for supporting evidence. Come on with a reasoned argument, you'll get reasoned discussion. Mostly, anyhow.
Just some thoughts.