Heey BOSSANOVA,
Nice to see you are experimenting with companion planting. I've not tried it before but have been thinking about this as well. Recently I found this section on the RQS website:
https://www.royalqueenseeds.com/48-companion-planting
Maybe it's of use to you, maybe you've seen it already. Keep us updated in how this works out! Would be interested to know if you can keep fungus gnats out woth companion planting.