While we wait to hear back from Articulate, I have a solution available now that uses DeepL to translate Rise 360 XLIFF 1.2 files. Not much will change what you do now (ok, maybe saving those extra work/hours!) - export the XLIFF from Rise 360, use the solution to make the translation, and then import back into Rise 360. The solution also supports Storyline courses, too.
If you would like more information, please let me know by either a private message or reach out to me on LinkedIn (usually the best as sometimes I don't get private messages from the forums).
Thor