So, this is possibly quite obvious, but I don't find any definite statement for this: How would one go ahead and exchange their TOKEN for UNITY solely through the NXT network at this point?

I could of course just send my TOKENs back to the issuing account, but... again, no official info on this to be easily found. So how can and should I do it?

Redeem TOKEN for SuperNET
If you have TOKEN on NXT AE, send it to: NXT-7Y5B-J8LQ-SL5P-3ULFL (alias: RedeemTOKEN)
It will be converted to SuperNET and sent back to your account within 24 hours. It is done via a manual process run by valarmg