Excellent comments; please keep them coming.
I anticipate working exclusively with the 80mm Planar for the first 6 months to a year before even considering another piece of glass. I feel like I need to learn creative discipline and proficiency with the 500CM and 80 Planar before expanding my options. At least for the time being, it seems like options #1 might be my best choice. If I'm not changing focal lengths with different lenses, I likely won't need the versatility a bellows-style shade would provide. Option #1 is especially interesting to me considering that bdial states I can use a stock lens shade with a B60 filter attached. I imagine simple will mean less distractions as I learn Hasselblad and relearn film.