On an updateable BAQ, does the GetList method get fired during the BAQ Export process?
Do any of the BAQ directives run?
If not, is there a way I can get them to?
It does not we’ve tried a thousand ways… short of you calling the method yourself… no BPMs get called
Sad day… I thought I was on to something. 
Yup been there done that, actually just yesterday we wrote an external process to run an Updatable BAQ on a schedule. It was fairly simple, using REST, or WCF