Hello,
[sb_private_reply]We Really Apologize about the Delays in replying to your Support Query and Really Really Appreciate your Patience with us![/sb_private_reply]
We Definitely agree with your Issue. Actually, when we created the Font Icons while building Canvas, 2-3 Font Icon Libraries were merged together which was definitely not a good practice to follow and we really apologize about that since we never planned about Updating the Font Icons. So it is currently not recommended to Update the Font Icons right away replacing the Old Icons with the New Ones since this would need some precision so that all the users are not affected. We are still trying to find the best way to fix this up and we truly appreciate your Patience with this.
Meanwhile, you can Definitely add your Custom Font Icons by using the IcoMoon App: https://icomoon.io/app/#/select . You can then simply add the CSS Linking of the Custom Icons you have just generated in the Document <head> and add the Icon Classes accordingly.
This will definitely work fine. Let us know if we can help you with anything else or if you find any other issues.