I'm certain that Zamenhof must have considered that. If you have occasion, at any Esperantaj kunvenoj, to discuss the issue, I'm certain that most Esperantists would understand you. However, try figuring out how to say undead. (Senmorta and Nemortema as well as ĉiamviva already exist to mean "immortal", BTW)
Looking at Butlers Esperanto - English dictionary, the entry under MORT with all of the affixes, etc, is pretty much a full column. The entry under VIV is just as long and already includes malvivi.
Keep up the good work, you are starting to think like an Esperantist.