I haven't used Detours in years, so was surprised to see that they have a "professional" version now - it's like $10K in the Windows Store. I only used the free version, but it was awesome to work with and made trampolining a lot easier than trying to hack it all in by hand. We used it to integrate some of our in-house trading system's interfaces into a third-party order management system that we didn't have the source code for.