...one other thing that occurred to me.
If you want to ride this but are uncertain of the BB maintenance and lubrication history,
it's not unheard of to simply drip some relatively viscous oil in the BB bearings by sliding
it in past the crank spindle, with the cranks in place. You can usually get by for a couple
of months at a time using this method. Use 40 weight or Phil's tenacious oil or similar.
Clean everything off the exterior when finished with solvent or citrus cleaner.