As requested by Alon, I will explain I made the webmin module deb file in TKL OpenVPN.
The good news is, webmin provides a simple script.
This script takes a webmin module and turns it in a debian package.
I had to install fakeroot for it to work. All other requirements are already installed in TKL Core.
Here is some sample code that I used for the OpenVPN tklpatch:
apt-get install fakeroot tar zxvf openvpn-2.5.wbm.gz perl makemoduledeb.pl --license GPL openvpn
The module extracted to the openvpn directory.
The .deb package was saved to: