Just wondering what specific microphone are you planning on using? So any microphone outside the mask would be muffled but it seems like you probably couldn’t get a microphone inside the mask
So for something on the cheaper side of things, a system like this seems like the best approach imo if I am understanding you correctly
While your voice may still be muffled by the mask, if you position this correctly you should be able to amplify your voice to a moderately loud level. Of course a product like this would not yield the best fidelity, but it would get the job done without spending for a professional system