The reasons you mentioned are valid.
I would be fine reuploading the content
I would prefer creating a backup account like ecoinstant.3speak just for the sake of storing your videos in decentralized system too. About:
do you think this would be acceptable to the 3speak team?
Everything is ignored as long as rewards are declined and content is rewarded in a one time way.
I would personally prefer u to add upload in any alt account with rewards declined just for sake of extra backup and add the 3speak link in your main account posts too.
This suggestion is given based on the two points you shared. Thanks for understanding, have a nice day!