Ah, that makes more sense. I (before coffee, that's my excuse!) got a picture in my mind of a small office. This sounds like a conference center setup...
I'd still be tempted to put in a big-horsepower router (x86), as you probably want good SQM on it to manage all those streams and reduce bufferbloat (thus making your guests much happier). A couple hundred dollars for a router is probably going to pale in comparison to the cost of all the WAPs.
Here's a comment I made last week about a Aliexpress "mini-PC" that I got last year, it may or may not be of interest to you: