There have been a few threads on using Memory Palace or Memory Palace like techniques for learning readings. Here’s the one I started back in 2019. Several others are referenced in it.
For me, I’ve been using a Person/Action setup for learning readings quite successfully, rather than the WK mnemonics. I found the WK mnemonics to have too many edge cases and misleads (see that thread if you want more info). I don’t know that that counts as the full “Memory Palace” since it seems to mean a lot of different things, but it works well for me.
I think any memory technique is only going to get you so far with language learning. There is, in my mind a difference between “remembering” and “knowing”, if you know what I mean. “Remembering” using any memory technique is just not going to cut it in a conversation, for sure. It’s just too slow. But “remembering” is a great first step that becomes “knowing” with time and practice. It’s a scaffold on which to build. It’s training wheels.