"Welfare" for moles ? ..any proposed measure by whoever, just falls far short, anyway. If translocation could prove to be a viable alternative, to any lethal control method,...i would adopt it, where possible, & as a way forward...but alas, any preliminary field trial results (very limited, right enough) by the wildlife researchers, etc, in that regard so far, have proved inconclusive. I personally feel , there's scope , for further more extensive field experiments, nevertheless. (easier said than done, I don't doubt )