Where can I book a manta ray snorkelling/ diving tour in Komodo without having to see the dragons?!

Im doing a 4N3D trip to Labuan Bajo from lombok and manta rays arent included. Once I get to Labuan Bajo I have a couple of days there before I fly home.

I've been searching everywhere for a day trip JUST to go snorkelling around komodo to see the Mantas, (and other snorkelling sites) but every tour seems to stop at komodo to see the dragons which I dont want to do again as its already included in the other trip.

I just want snorkelling/ diving and thats it. where can i find a tour that does this?? any recommendations?