If:

• you find that Bluetooth radios and/or adapters are too costly,
• your ear protection has a 3.5mm input jack, and
• you're willing to consider a wired solution...

consider a remote speaker/mic (something like this with a listen-only earphone jack) and a short coiled 3.5mm male-male cable to connect to your ear pro.

This setup works well with my Walker Razor ear protection.