Lots of spells would be much better than Remove Disease, even if we don't pick up Panacea.
Blindness/Deafness would be a good offensive option, as would Dispel Magic.
There are not very many living creatures that can shrug off being blinded. Look how poorly that went for the Mallor.
And even though Tyene learned Dispel Magic just a couple days ago, it wouldn't be strange or out of character for another of our caster's to pick it up. Up until now, we've only had Viserys for dispels, and there's been several times when we've had to choose between casting a combat spell and dispelling an effect. With the party being split up into smaller groups now, we should always have someone capable of casting Dispel Magic in each group, as we're more and more likely to encounter enemy spellcasters.
It's better to let Lya and Dany prepare specialty or situational spells and leave utility spells we might need to cast repeatedly in a short period of time to our spontaneous casters.
We don't have to reach too far afield to find good options.