I'm going to get the 7Hz x Crinacle Salnotes Dioko IEMs but I want to make them wireless. In the video (https://www.youtube.com/watch?v=sMTs5bvAsGA) they feature the KZ Apt-X HDs from linsoul, however they're sold out right now. Which other adapters would you recommend instead of these. (Must be 2 pin 0.78 plug.)
Depends on what you mean by "Good." Wireless sound quality will never be as technically good as wired sound quality when played from the same source. I say technically because the differences can be imperceptible to humans, so your best sound quality will probably come from the wired IEMs. If you care about the convenience and stresslessness of wireless, I'd recommend buying a proper set of buds designed from the ground up to be wireless, rather than jury-rigging a (comparatively) cheap set of wired IEMs.
Slightly different but I coupled the FiiO FH3 with the Qudelix 5k and I find it quite enjoyable. I've added a Lavalier microphone for taking calls. Bluetooth distance is good and sound quality is great to my untrained ears.
Still have to figure out the cable management with both Lav mic and IEMs. Aside from that it's been a joy to use.