The stated goal of this topic is to get internal microphone working. Switching software audio servers is not likely to help with that if the microphone is not detected and enabled in ALSA
I suggest get more information about audio devices detected in PulseAudio before it is replaced
pactl list cards; pactl list sources
pactl works on pulseaudio and pipewire-pulse so you could get comparison data for the microphone if it does not work with pipewire-pulse
removing pulseaudio breaks dependency ‘pulseaudio=17.0-3’ required by pulseaudio-bluetooth
removing pulseaudio breaks dependency ‘pulseaudio’ required by pulseaudio-ctl
pulseaudio-ctl has recently been confirmed to be incompatible with pipewire-pulse and should be removed
pulseaudio-bluetooth is required by manjaro-pulse that may also need to be removed before replacing PulseAudio
pamac remove manjaro-pulse pulseaudio-bluetooth pulseaudio-ctl