Homebrew charge tracking: is this feasible?

I've posted elsewhere that I am less than impressed with Connected Services and its reporting on my 2024 Prius Prime's charge history. Connected Services has now expired, I'm not going to pay $ for that quality of product, but I'm curious if it's possible to create a home-brew rig to replace the charge history.

Parameters: I am a professional software engineer; computers, networks, and data do not scare me. I am a relative newbie to automotive systems, however, so there are places where I don't know what's possible or how difficult it may be to do.

This is the plan I kind of mapped out in my head:

1. Add a small network-enabled computer to the Prius Prime which can connect to my home wi-fi network. (Something like a Raspberry Pi.) This computer would sleep most of the time (don't want it drawing power) but would wake up and dump data at a fixed time of day (probably early morning) or on specific triggers (like returning to the home WiFi network after being out). Time-based reporting would be pretty easy; event-based is a little trickier, but not impossible.
2. This computer would need to read data from the Prius Prime. I am hoping something like a Bluetooth OBDII interface would allow this to happen with a minimum of wiring-harness shenanigans, but this is where my lack of knowledge comes through: I don't know if the data I'm after is accessible through ODBII.
3. I'd need an API service running on a host in my network to receive and store the data. (This is the part that's actually easy for me; I do this stuff professionally, and I can visualize a service running on my existing NAS which would receive data dumps and provide some basic reporting.)
4. Ideally the "cleanup" would include disconnecting the Prius Prime's cell antenna so the data is no longer reported to Toyota. (I know this is not a widely-shared opinion, but my position is that if I actually own this car, I should have control over where its data goes.)

How much of this is pie in the sky? Is battery charge data available through OBDII, or would I need a different data source? Is there an easier way to do any of this? Has anyone tried anything like this? (...why not, given the vibe I get from this crew?)