Update.
After initial testing this seems to work just fine. When an action (part of e.g. process) executes the AutoIt exe script, your application displays an "Saving data" progress indicator/message which is displayed for the time set in the AutoIt script. After the time set, the process continue processing the next action etc..
I have only done a quick test to see if it can work and it does but if anyone test/use this more extensively please share the results.