Johnny, to me this sounds like you're asking the wrong question. Why do you want everyone to share the same config? What do you do when one of those users gets compromised?
If it's just a matter of saving work, may I humbly suggest that you consider our
OpenVPN Access Server product? It adds a lot of bells and whistles for busy administrators. Yes, it costs money for more than two simultaneous connections, but you can try it for free and see what you think. Sorry, we're not here to sell you stuff (and I myself am a very long-time user of the community software), but there are use cases where AS makes economic sense.
Re: the howto, I have not reviewed the one you used, but most of us here are familiar with the
official howto, I can well recommend that one.
Regards, rob0