The thought definitely crossed my mind before... the concept is good but I never have set up a percolator for anything so I can't say for sure. It should be easy enough to test the powder by taste afterwards to see if the bitterness is gone, and you can always boil down and do whatever with the results. The only thing at risk is some time

I recently found that shredded, freeze-thawed, and then sundried skins give up all their goods to tea in about 1 hour (!) so I'll probably stick with that process. But by all means, do some experiments and satisfy your curiosity.