In order to reduce load on this server, I would like to run these tasks on a different server (with a personal QV license).
Possibly you meant developer license. I can think of one issue of - not getting server license support for the second server(which is probably just another system and not necessarily a server) from qlik.
I would say that Publisher would be an overkill if you are just looking to prepare QVDs for your QlikView server.
Also I believe you are aware of the limitations of the personal edition license. But leasing a developer license for the application on the QVD creation server would solve it.
To answer your original question, this configuration does work and there shouldn't be any problems. There will be some manual maintenance but nothing that you can't handle.
Preparing QVDs are normally not the most taxing thing to the server, unless you're trying to reload a lot of them simultaneously. If you are having performance issues you might like to look into your scripts, models and even check if your server is sufficiently spec-ed for the task.