Lost original tracks and need to duplicate playlist

Hello, I created a playlist which I linked to a MYO card, and shared the playlist with family.

Due to limited space, I deleted the original tracks from my phone. I since realise that the playlist link shared is pretty dynamic in that any updates I make on my end update the playlist for all.

I initially thought I was sharing the playlist contents just the once and didn't want to share updates (as these are my own recordings for my child). So I wanted to create a new (private, playlist). But this would mean I need to reupload my original tracks which were not recorded on Yoto- and which I deleted from my phone.

I see others here have asked about duplicating playlists as an option- has anyone found a good workaround?