You may be surprised to know that Cleanse will remove all stacked viscosity damage, or at least I was when I found out. That’s quite a boon for the common Viscosity and something to consider the next time you get that enchantment. It can be particularly useful if you play with the Faith is my armor challenge.
I still haven’t incorporated FIMA into my challenges, still at 5, but I think an accessible combo like this can help build my experience with FIMA on. But yeah, I imagine with 9 challenges or around thereabouts, this would simply be an option in a wide slew of tools that would need to be employed to survive.