Plugdata seems like a deep rabbit hole, so I'm a little afraid of it but maybe that's the next step.
For now, I'll share my latest Linux plugin find: https://store.harrisonaudio.com/all-products/harrison-32classic-channel-strip says it doesn't support Linux but if you buy it and download the "old" version from here https://support.harrisonaudio.com/hc/en-gb/articles/19516617411613-Harrison-AVA-downloads-OLD-VERSIONS (it has the same version number as the most recent Windows copy), then you can activate it and it works well. I think I had to say no to linking iLok when purchasing. It's crap that they've recently stopped supporting Linux (because they've moved to using iLok) but I've been happy with the plugin.