That's awesome, yea at the moment testing a couple of tomato plants out doors in sip buckets.
A good option to go hydro and use coco would be the Hempy.
Hempy is just a common 5 gallon bucket with a hole drilled 2 inches up from the bottom. You want the hole about the same diameter as a nickel or quarter.
For the coco the good choice is the chunky or chips. Not the fine coir bricks because that will just wash out thru the hole.
When I did this I used the Lucas Formula for nutes and the later got a free sample of H&G Cocos which really performed well in the coco hempy. I've also seen it done well using Veg+Bloom and other similar all in one nute lines.
And that's real simple to use like SIP. Just water thru the top until it comes out the hole. After a day or two when the plant sucks most of the water in the bottom add more just like a SIP.
I don't see many doing Hempy anymore but around 10 years ago lots of growers were doing it so if you do a deep dig on forum diaries that go back that far you'll see lots of grows having success with it