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.
In that case I second the opinion to just get some natively wireless buds and EQ them with an app like Wavelet if you want them to be flatter (in terms of frequency response).