In the thread ‘Update on my plight’ https://chiaforum.com/t/update-on-my-plight/14404 - very long one with a few sidesteps’ this came up in post 96/145 by enderTown.
In short his statement is yes you can (what you asked) and after some discussion back and forth I believe him fully now. Don’t have use for this myself on my main rig but I’m currently syncing a VM just to play around with it.
Feel free to take a look there (skip to post 96 is my advice;-). The basic idea is that starting chia by GUI or CLI starts all processes (node, farmer, harvester, wallet) immediately, and clicking one of your wallets in the GUI just shows one wallet, but both (or more) are farmed on when mnemonics/fingerprints have been loaded once before.