I too have VKH. I understand what you mean about frequent infections with methotrexate.. It can seem like an endless cycle of infections.. even if the VKH and uveitis is 'quiet', other illnesses pop up and seem to drag on for an age! From what I've heard this seems typical with this medication. Although with VKH being so rare, I find that the majority of people I've chatted to are taking MTX to deal with other autoimmune conditions such as Rheumatism. I'm sorry to hear about your cataracts, I hope they can be treated. Please feel free to private message me if you would like to chat.
All the best