Worth sensitizing a film that expired in '95? That's a tricky question... but I think that your interest in bath-sensitizing coated film is very valuable and worth exploring.
I have a description of panchromatizing an emulsion with erythrosine & get this.. a chrlorophyll tincture harvested from blue myrtle leaves! F.E. Ives did this in the late 1800's.
This kind of experimentation would benefit the whole analog community. Imagine how great it would be if you could find a way to post-sensitize LiquidLight and other pre-made emulsions? This would open up a whole realm of interesting stuff...
I think you'll have to do some original research & work though.. I don't believe anyone is currently doing this.