Don't really need to use swim here, actually its fairly looked down upon. Culpability makes people more professional probably.
https://wiki.dmt-nexus.me/DMT_Extraction_OverviewRead that so you can better understand some of the processes.
The base soup you want to use could work to basify, but keep in mind that you will have more matter for it to come into contact with, might require more basified solution to achieve the desired pH.
I dont see a reason you couldn't do it, but you're still going to use more of your base, I'm sure. Keep in mind that you are using (I'm assuming), lye. Which is drain cleaner. Thats designed to be flushed, mate. I would for sure worry more about the amount of solvent you are using.
Personally, I don't like lye and I tend to work with the food safe (except my solvent) Q21Q21 lime tek .