If I don't want to scare off wildlife, what are some lower cost options?

I see back in 1997 Shimano made the Delore LX FH-R050 (and FM-R080) which were silent freehubs? Does anyone else make something like that? I guess it's the hub itself that makes the noise? So a simple freewheel gear replacement is not going to solve the noise problem, I would need a whole new wheel and hub?

Thanks for any ideas!

added: found two more "silent" models FH-IM70 and FH-T300