I'm speculating here based upon my experience with the Makita but not for the specific task you've outlined, but I think that might be asking too much of the tool. The Makita excels at removing things that have built up on the surface of the wood, but not stuff, like stain, that have penetrated into it. I doubt the nylon brushes would be able to handle that. The wire brush could be pressed in to get some of it, but the amount of force probably required to do that would start degrading the profile and raising the grain before all of the stain were removed. And the fact that it's pine would mean that degradation would happen much more quickly. You'd probably be better off working with the LS 130 and a custom profile, at least to handle that large concave channel.