I wrote NWC Prisms for this: https://supertestnet.github.io/nwc_prisms/

You can insert an NWC string as a funding source and then a list of recipients (enter their lightning addresses). Then you can pay the prism (1 qr code; the money actually goes to an ecash mint) and my software send a percentage of the total to each recipient (it really just tells the mint to do so, but it works unless something bad happens).

I haven't tested this very much in production and you can definitely lose money with it (e.g. if the mint rug pulls you). But consider testing it and reporting any bugs you find! (You will probably lose money during your testing.)