As recently as couple days ago I was in the same situation which monitor solution I should give a second go. So it's still in my head and so I might be long on this one 🙂 I actually bought this Divevolk solution after having terrible experience with Weefine's WED7 couple years ago. The problem with workarounds like divevolk is that they do not tend to work when one would need them. Forget about the lag, it's not that bad, the connection and the reliability of establishing it over and over - at least on Sony - is the real issue for me. So when I imagined logistics on a live aboard where most of my dives are with 3-4 dives per day checking the footage in between the dives - it was a real nightmare. Plus the element attached to the housing should be placed on acrylic effectively blocking access to camera monitor... So I swallowed the pill and bought Shinobi with Nauticam housing... I was also researching the other Chinese units, Kraken with their 3000 nits looked promising but all that proved to be a vaporware. For one their negative buoyancy is like 600+ grams (what they say, so double it, I think Wed7 was like 1000g if I remember well) and second they lie in their marketing specs about the size, ability to import LUTs etc... And so the available options for at least 1000nits monitor shrunk quite a bit and since I preferred long battery life over recording capability it was Shinobi. Good luck.
