Not the OP, but my own emacs development MO is to run a persistent shell buffer and bind F8/F9 to send make/run commands. I think that would work with your use

Not the OP, but my own emacs development MO is to run a persistent shell buffer and bind F8/F9 to send make/run commands. I think that would work with your use case. You'd still keep a synced code folder since you have to run the swift completion daemon on your local machine.