Love ringwood. Love mild's. love the idea of open fermentation in a clean environment.
If you can keep it clean go for it. But you must keep it in a clean space.
The original idea of a mild was young beer without the "tang".
So it was conceived as a way to make a clean beer without wild yeast taking hold.
The tang refers to wild bugs getting in the wort during open fermentation. So young really meant consumption before brett pedio or lacto could take hold and spoil the beer. So make your beer keep it clean and drink it young and you'll be close to a traditional mild!
Cheers