I don't think it would be terribly difficult to string them together in a campaign. I haven't read all the way through it yet (I'm reading Zikran's Zephyrean Tome right now, which is what brought me to this thread with a question I'll ask further in the post). So far, the biggest issue is in adjusting the hook for the adventures. Presumably the characters work for the library if you want to run all the adventures together, so you may have to come up with some slightly different hooks - especially for Shemshime's Bedtime Rhyme. I was considering making the party a special kind of Avowed, who often do general Avowed duties but also are generally the go-to people for dealing with out-of-the-ordinary stuff, and also as extra hands around the library. So for SBR, maybe the characters are assigned to assist in the renovations, or maybe something happens to their usual lodging and they are temporarily assigned bedrooms in the Firefly Cellar.
The one I'm struggling with figuring out so far, even for a standard adventure, is ZZT. It says the book "snaps open when the book is held by someone who intends to leave Candlekeep with it." But there are strict rules about leaving Candlekeep with books... unless it's merely referring to the library proper, and anyone who would take it out to the Court of Air would count? But I guess someone could be intending to steal the book, which causes the genie to appear and then the person to be taken into custody and the book handed over to the party to deal with.
So with the intent of running the adventures as a sequential campaign, does anyone have any tips for changing the adventure hooks? Any additional ideas for incorporating loose threads from the adventures (NPCs the book suggests might pop up again, mostly) into later adventures in the campaign?