Your implementation/idea looks interesting, but I am looking in different direction. I do not want web based. I am often in areas where I do not have network access. I do not want to deal with security breaches, vulnerabilities, down times.
I do not want to type things. I am looking for a tool that will take voice recording and convert it to text on my desktops and and most importantly my (Android) mobile devices.
I have been using text files in markdown and raw text before that, for decades. They are searchable, quick and accessible across multiple platforms.
Yet, I still use my dictaphone[0]. It requires pressing a single button, it records my voice, time stamps it, and files it.
I am looking for a solution where the app behaves as a dictaphone, and voice-to-text is performed, and the files are local if I want them to be.
Make something like that and I am willing to drop coins.