The TFZ Audio Sense T100 earphones (~$45 on AliExpress) sound really good (surprising low Bass thump), and have a thin nozzle that uses T100 sized tips. Their housing is shallow enough that they're comfortable to sleep in, without causing my ears to hurt.
https://www.aliexpress.com/item/New...io-Spofts-MMCX-3-5mm-Earbuds/32852429019.html
Thanks @DBaldock9. Probably out of my budget range (didn't put that in the post, sorry), but if I will read up on it, along with any other suggestion. I found a PDF compatibility chart on the Comply website and will be researching all the ones listed as compatible with their T100 tips. Don't know if it is up to date, but I do know it doesn't list all models of all brands (i.e. it just lists 4 KZ models in the T200 and T400 sections).