Allow Mobile App to connect via a Remote Office Server DMZ?

Our Phone/Tablets do not touch internal networks.. And we do not allow VPN service on iOS/Android/ect.   Thus the app is un-usable.

Since we have a Remote Office DMZ Server already for Desktop Central & Field staff.  If we could point the iOS app to that server..  It could prove useful.

I've tested it with the standard 8383.  HTTP: 8020, DSHTTP 8021, & DS HTTPS 8384.

Thanks,