Updating Parent Listing to a new variant theme

I currently have a parent listing with 5 child asins assigned to it in one standard color. I only have “Size” as the original variant, however I have started to introduce other color variants. I have good sales history and BSR, with one of my child asins being an Amazon Choice.

My question is if I remove my parent listing, and recreate it with a “Size and Color” variant theme, will I lose my BSR? Are there certain things to avoid when removing a parent to create a new one with a new variant theme?