I suggest that there should be 2 semi-courses in the Chinese language course. One is a course on Traditional Chinese, and the other is a course on the Simplified Chinese (which Duolingo already has)
Lingodeer has an option in their Chinese course to set the characters to either traditional or simplified, which is something Duo should consider. While I like your suggestion of making a semi-course for Traditional Chinese, I think it is cheaper for Duo to make a setting similar to Lingodeer's rather than copy the same course using traditional characters.
In the incubator there is an option to contribute to a Chinese (Traditional) course for whatever speakers that has yet to be developed. It uses the Taiwan/ROC flag.
I agree with you, it`s quite annoying open the Google Translater to look for a Chinese tradicional character when I already know the simplified character. I realy would like to take a course on traditional Chinese and I would not have to look for it all the time anymore :D
Most of the time there is only a single traditional version of each simplified character. (Sometimes multiple traditional characters were merged into one simplified character.) So it is not unreasonable to use a computer to convert simplified to traditional which is what this Chrome plugin does: https://forum.duolingo.com/comment/26135150
The other issue is differences in common vocabulary between places which use simplified (i.e. Mainland China) and places that use traditional. Duolingo sometimes supports those alternate vocabulary in answers, even if it doesn't teach it.