I don't know what your numbers are on the links, but RC guys usually drop in th $100 range for working metal tracks with sprocket and idler. I'm not sure I've seen static guys spend that as an add on just for sag, so I'm guessing your target is lower. If you could swing drilled out, it would be a slam dunk for you, even if it wasn't assembled. Xion makes you assemble their metal Kettenkrad tracks and that kit is $250. Fruil just gives you links and a bunch of wire.
I thought/felt the same way as you when I started in this business in terms of proprietary info and bootlegging. Truth is, as soon as you start selling an item, if it's worth it to someone or easy enough, it'll be bootlegged, believe me. I sculpt masters for figures and bootleggin is always an issue in that field. I know a guy who premiered a figure on the first day of a big show and copies where being sold at the same show by the third day
. You needn't spend too much time worrying about it or let it keep you from selling a product. Your North American, European and Australian customers will buy from you and when knockoff arise on eBay, etc, they can be stopped. A good customer base will even report this to you.
I'm the maker of this tool as well as others:
Every production run in the US got out of hand in costs and eventually it wasn't worth it to me, no matter how high I raised pricing. It's been a few years and I still get requests for it with a very long waiting list in case I produce it again. You would think it would have been copied by now, but it hasn't, because it's difficult to do. As it is, your kit could have been easily bootlegged by now.
Please don't take that as me trying to tell you what to do, I'm sure you'll sell more to static than RC, I'd just hate to see an opportunity missed since once those precious little links are cast in metal, the RC floodgates will be open to Hetzers, Marders, Vorps, etc...