Here is an interesting dissertation about the perception of pitch accent by non native Japanese speakers and a procedure to train. It details also a short training procedure (6 sessions of 30 minutes in one month), that seems to produce real skill improvements in perception and production. There is probably something to do with this (Anki deck?), at least for improving perception (checking correct production would require more work and sophisticated tools, if no Japanese guy is available). https://kuscholarworks.ku.edu/bitstream/handle/1808/8022/HiranoCook_ku_0099D_11708_DATA_1.pdf?sequence=1&isAllowed=y
During my reviews on Wanikani I sometimes try to guess the pitch accent then check on Takoboto or Yomichan and, guess what ?, it is not as difficult as I thought. And it is quite fun, so finally I think that it is something that could indeed be recommended even to beginners. I try this sometimes on BunPro too but it is much harder to perceive pitch accent of words inside a sentence (so maybe this is for a next level).