Italic variant out of a custom version of Fira Mono

I know that this isn't from the original Fira Mono repository but this guy did a rather good job making a custom italic variant of Fira Mono.

https://github.com/zwaldowski/Fira/tree/zwaldowski/mod-new/otf

I've downloaded Fira Mono Italic and tweaked its name to "Fira Code" via FontForge so that it appears as the real italic variant of Fira Code in my font manager.
By doing this, my text editors use the custom version every time they need to use the italic variant (such as in comments or static methods/fields). This is the result:

To me it looks way better than all the editors trying to fake it. The problem is that there are no ligatures (as shown in the picture) because it's Fira Mono, obviously.
What do you think about creating Fira Code Italic out of that?
Hopefully an original Fira Mono Italic will come out, eventually, but in the meanwhile this might be an acceptable alternative.

Start by reviewing the referenced custom Fira Mono italic files in the otf directory and compare them with the Fira Code font assets. Check whether the italic design can retain Fira Code’s programming ligatures. Done means establishing a feasible, project-appropriate italic variant or documenting why the proposed source cannot be used.