I am biased. I'm also only now starting to non-committedly peruse of the forum.
In my opinion the most correct way forward would be to:
1 - Create an Archived Channels category that sits under the 'Other Languages' Category.
2 - To have viewing rights of the archived channels be tied to a role.
3 - #🧩feedback-chat 'could' be reopened, 'or' #sar-discussion could be opened to take its place. If the latter option, then refer to points 1 and 2 for the way forward.
#💬general does not cater for what the closed channel did - and it probably shouldn't be pressured to.