Android Voice recognition default keyboard, just for HA assistant/app?

Hi, quick question into the round: did anyone figure out a way to define the local google/android voice recognition “keyboard” as the default keyboard just for HA? The local voice recognition built into android works pretty fast (2 seconds vs the supposed 8-9 seconds for a whisper setup on my Raspberry, therefore I’d like to use the local version built into android. But i only need the voice keyboard for HA, everything else is still typing.

Any hints? There seem to be options by rooting the phone, or by combining tasker/macrodroid with additional plugins, but that is a bit much overhead for my taste.

Thanks in advance!