A quick option, and one that would allow exporting to other Wiki software at a later date, is Zoho Wiki. The main drawback of this option is their pricing model...

I don't know if SSC could add a Wiki to the many useful categories already present but I've used Zoho Wiki for my own personal good practice notes for years....

Can you provide more detail about the size and complexity of the indexes on the specified tables?

Don't reject replication out of hand. It sounds like your environment is changing rapidly so any solution is going to have to be changed to reflect those changes. At least...