How to choose earbuds with a CRT pacemaker?

Clearly, with a Pacemaker, you may need to be careful with some devices that emit radio signals and or include magnets within their construction - this being applicable to your iPad and iPhone as well as accessories used with them. You would be wise to check with your medical practitioner as to the precautions necessary for your particular situation.

That aside, if you need to avoid Bluetooth or other wireless EarPods or Headphones, you might consider using a USB-C to 3.5mm Headphone Jack Adapter - and any Earbud or Headphone that has a regular 3.5mm audio plug.

https://store.apple.com/xc/product/MW2Q3ZM/A

You're very welcome.

In regard to your pacemaker, I hope that you receive the information/clarification that you need from your practitioner.

You are free to buy whatever you want.