Maybe I'm just a hardass but "wireless IEMs" just sounds like an oxymoron to me. At that point, just get some Sony WF-1000XM5 or AirPods
BudgetAudiophile
A place for AUDIO enthusiast to share, discuss and listen to others people setups
Would either be as good as these IEMs with the cable?
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.
Are you planning on using them for mixing?
No, for music listening
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).
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.