I couldn't do option 1; there's nothing IN the backyard right now. I
bought a starter kit today that included a pressure reducer... I got to
digging this morning and it looks like thee output for the unused
manifolds are using 3/4" pipe thread. They have some of that large
black tubing (1" ?) used for the sprinklers. I'm thinking of taking
that off and just putting the pressure adaptor for the drip system on
that.

Will let you know how that works.

Pat