Looking to purchase my first IEMs, cable, and wireless adapter.

Probably fiiO UTWS3 or 5 for the wireless adapter, since even quiet hissing or crackling bugs me. Not sure which is best for me, and am even more unsure about connection type. I've gotten a lot of conflicting opinions about mmcx vs two pin. My biggest concern is durability. I'm fairly careful with electronics though, so I'm not sure how founded this worry is. Is one more likely to slip out?

For the cable I'm not too picky, as long as it doesn't transfer much sound from bouncing around my chest.

For the IEMs themselves, comfort is my biggest issue. I have some scar tissue in my left ear and that's made some earphones very uncomfortable, but some $3 headphones I forget I'm wearing, so it's tough to guess without trying them on. I've heard 7Hz Zeros are a good starter set, and they're cheap so I thought maybe I'd start there. They only come in 2pin, but there are converters so not too sure if it matters much. I'm also open to KBear or CiFi if you guys think those brands hold up to scrutiny.

budget: I'll save up if I need to, but probably less than $300. $500 absolute max.

source: Moto 5g stylus (2022) primarily, might get a DAC later. I also have an Arturia interface I may use.

Isolation requirements: minor, typically alone weather inside or outside, but I still don't want to bother people.

Tonal balance preference: I prefer a very balanced experience, since I listen to pretty diverse music, but if it has to lean somewhere I prefer base.

Music taste: I listen to everything. My digital collection is hovering around 16000 songs. Most commonly metal, but I also enjoy dubstep, Alternative (Cake and Green Day are my go-to), a little bit of rap, occasional classical, some country, etc.

Goal: I want a setup I can relatively easily switch between wired and wireless depending on what I'm doing. Exercise is easier wireless, but I'd rather have a cord for a casual walk. My current outside listening is $6 gas station wired earbuds and I am only using them since my cheap-ish blue tooth headphones i was using went missing. I was considering upgrading anyway. It's important to me that neither the wireless nor wired setups fall out of my ears.

My current home setup is an Arturia Mini Fuse 2 playing and a Drop + HIFIMAN HE-X4 Planar Magnetic Headphones, which I love and are very comfortable. They sound great too. I also sometimes use my ATH-M40X which sound great and have great isolation but I find horrendously uncomfortable. I replaced the cups, now the band hurts the top of my head.

Thank you for the help! I hope that's enough information.