Welcome to forums,
I pressume that you have only core set right now.
In already released expansions, there are tools which allow you to Reconstruct non-living objects.
Mentioned [mwcard=FWC04]Goblin Builder[/mwcard] is removing damage from conjurations while after Nercomancer x Druid expansion was released, in which "Reconstruct" term was introduced, [mwcard=MWSTX2FFC09]Otto Kronig, Master Engineer[/mwcard] is able to "Reconstruct" non-living conjurations.
Also, in mentioned Necromancer x Druid expansion, there are spells and creatures with abilities, which are able to "heal" themselves while they are non-living thus having Finite Life trait. [mwcard=DNI03]Reassemble[/mwcard] or [mwcard=DNC03]Devouring Jelly[/mwcard]
One last thing, which allows you to have non-living things on board longer is to rise their total life by "Innate life +X" trait. Growth marker is now doing this effect for living and also for non living creatures. [mwcard=DNC12]Shaggoth-Zora[/mwcard] or [mwcard=DNC11]Ravenous Ghoul[/mwcard].