Forestry helmet: use headset and loudspeaker simultaneously

I want to use my Motorola TLKR T80 with a helmet but I need that both the headset and the internal loudspeaker work simultaneously so that I can always hear with ear protection on and off.

Can I program that function or can I solder some contacts?

Hi, could you clarify the question? When you say “internal speaker”, are you referring to the speaker built into the front of the radio itself, or an internal speaker built into the helmet?

In other words, are you searching for something that will allow you to use a headset and the built-in radio speaker simultaneously?