I've uploaded a zip archive containing an app I created called IconSerBuilder that automates the task of creating a DOpus iconset (.dis bundle ) that can be loaded into DOpus via Preferences->Toolbars->Icons. See the attached INSTALL.txt for install details.
The app was developed in Python so that is a prerequisite. Instructions on Python installation are included in INSTALL.txt. It's a pretty simple process via the Microsoft Store. The app is hosted on GitHub so please have at it if you'd like to make and host changes. I'm a hack so I'm sure some of you Python developers will probably come up more elegant ways of doing things.