I discovered this working GitHub that contains an ASI Converter that makes .Asi files into .RASI Files, Working with the latest RPH (0.54).
Here is the link: https://github.com/fr-Pursuit/AsiSupport/releases/tag/0.2.0
(Requirements)
.NET Framework 4.6 Visual C++ Redistributable 2017 (x64)
Rage Plugin Hook
(Installation)
1. Drag "AsiSupport.dll" into the "plugins" folder of the game directory.
2. Add any ASI mods you want.
3. Make sure it loads in RPH.
4. Done!
(Note this was not created by me, all credit goes to the original creator of this modification.)