Hey, Never can you please give some attention to the my posts here:
https://forum.cockos.com/showthread.php?p=1979115
Sorry, to ask you this but I think there are many misunderstood things about correct and expected purpose of a theme. It is not always about "looking fancy and futuristic, vintage, eye-candy or whatever.
Thanks! And I hope theme mod could be done much more easily from the settings in Reaper.