Dave, pardon my ignorance. What is a hiking 200 mm? I have a 200/4 MicroNikkor AIS, see my comments on it in the for sale listings. Not Nikon's best, and at its close focusing distance its focal length is around 135 mm. The AF version is much better but goes only to 1:1.
I've shot a 210/9 Konica Hexanon GR-II mounted, with adapters and a cheap Zenit belows with more adapters at each end, against a 200/4 MicroNikkor AIS at 1:2 (the MicroNikkor's close focusing limit on its own mount), at medium distance and at considerable distance at f/9, f/11, f/16. The Konica Hexanon won at all distances and apertures. So if you can bear to use a lens with manual aperture on bellows -- many people can't -- a good grade of ~ 200 mm process lens may be what you need. Think Apo-Artar (there's a 210), Apo-Nikkor (150 or 240), Apo-Ronar 150 or 240), G-Claron (210), Konica Hexanon (210), ... A 150 mm process lens will give less working distance than a 210 or 240 but will require less extension to get the desired magnification.
If the camera is on a tripod, how are you going to focus? Move the bird? If so, unless you use something like (pardon my choice of words, I don't know what devices used to restrain birds are called) a squeeze box on a rail to hold the bird, you're in trouble. Bird in hand is as unsteady as camera in hand.
Best practice with closeup work is to set magnification, then focus by moving (usually) the camera-lens assembly or (rarely) the subject.