That seems like a real creative way to remember Kanji!
Can you give an example how you “convert” the mnemonics to something in your memory palace?
I heard a lot about this approach, but never really in regards to Kanji learning. I for example would understand how you can remember a list of groceries - kind of by going through a room and seeing the different items - but I wouldn’t know how to use it if I saw a Kanji.
German is very similar to English grammar-wise, and even Spanish grammar and word-order is relatively easy to get a feeling for I would say. So I would guess learning Japanese is pretty much the same for me as it is for you. The only thing I always found quite easy was the pronunciation, because it is very similar to the Japanese way of talking. I guess that could be the same in Spanish, as opposed to English?