I made a new tab on Demagog's Vault page and filled in my idea of a good starting vault on my tab (the one named SkyVault). Feel free to copy the SS into your own tab and run through your own attempt.
I added some auto-card counts at the top, including the number of cards over limit (the top left number beside "vault"), the total number of cards used, the total number of earth cards used, total weapons, and total shields. They sum up the relevant fields below. That all gets copied if you use "duplicate" to make a new tab.
The top left box will say "Legal Vault" if you meet the requirements for the vault (within 446 cards, and at least half earth cards).
Making a viable vault for that many deck options is pretty hard. In my tab I tried as much as possible to include all the deck components in the other thread. My first attempt was 150 cards over limit, and I had to slash nearly everything I could to make it work. I cut the nymphs just because not everybody has them and I was trying for maximum flexibility. I also tried to give extras to cards that were central, or cards I'm pretty sure people will salvage from us.
I'd suggest everybody make their own tab if they want to take a shot at tweaking the vault, then we can make our final version from comparing those. It's easy to copy the whole sheet into a new one with the duplicate option, I made an extra tab (copy of vault) which is unclaimed, for the first person to rename it.