I have never added it to a wit but I have just done a Elvis type Juice with grapefruit peel, blood orange peel and the juices with 1/2 ltr of clemetine juice. It has fermented out and I have had a taste and it is good but the wife wants it to be more orangy so tomorrow 1 ltr of orange juice will be added to combat the grapefruit bitterness. Now to get to the punch I have added orange juice before and it works well in the IPA's I have done before, I have also used mango and tropical juice before and that also works. I know that one forum member adds grapefruit juice at the pouring out stage to his drinks and says that works too
I can't t remember where I read it but an article about fermenting orange juice asked why it is not a thing? We ferment apples, grapes etc so why not orange juice? The answer appeared to be because it tastes 5h1t3. I'm sure adding a bit to the fermenter won't do too much harm., but I'd be careful. I've certainly added orange peel before but I now like coriander seed and amarillo hops which both add an orange flavor.