TBJ,
After you've taken your demerits for fishing for chum on purpose, you'll earn further demerits for trying to fish a hootchie on a fly rod. Just say no!
If you still insist on tangling with chum on your fly rod, follow Bankwalker's suggestion about yarn. A short history story: years ago I ran into a co-worker along the lower Satsop River. I was searching for silvers, and he was hoping to catch a fish, any fish. He asked about catching one of the chum salmon that were concurrently running up the river. I cautioned him that we don't sport fish for chums. Yet he insisted. Since he grew up in the east and had last lived in Hawaii, I relented. As we walked along the river, I spotted a piece of slightly dirty chartruse green yarn on the trail. I picked it up and tied in on my hook, whatever it had been. We walked over to the river, and I showed him where the chums pass up the river, made a cast, immediately hooked a chum, and handed him my rod so he could play it. Then I intoned that I would then be required to hook two silvers to undo the demerits just earned for hooking that chum salmon on purpose. Chartruse yarn or anything else is chum candy.
Sg
PS: the above is slightly t.i.c., but only slightly.