Playback rate link to MIDI CC, possible?

Is it possible to link a MIDI CC to the Playback rate envelope from the Master Track? In general I can't really imagine anyone recording this with a mouse, it felt really wrong to me when I tried it a few times. The reason I want this, is because I (partly) use Reaper to edit MIDI files (mostly somewhat classical-music videogame soundtrack arrangements, so a lot of small edits are required because consistent tempo sounds really bad), and render them with VSTs, hopefully resembling a performance. I managed to optimize most things, like linking MIDI CCs to the velocity and a custom action that deletes the MIDI CCs exported by Sibelius which mess with the VSTs I use, but with the Playback rate, I don't really see any obvious way to do this. I looked at all actions I thought could help with this, as well as most MIDI/control plugins. I also went through 30 odd threads about automation recording and CC linking but didn't find anything, so please have mercy if I missed something. On a related note, I'm learning Python right now, so if you know it's possible with that, but it's too laborious for you, I'd appreciate it a lot if you could point me to where I could start (things like: addressing envelopes, sending MIDI CC etc.)

you should not use playback rate. You should use the Master track Tempo envelope. there is a lot of useful actions here installing the SWS extension to manipulate the tempo. Maybe easier than recording the tempo in realtime.

ah... ok... I see. It would be nice but I'm not finding the option to do it either. I should explore more the playrate. Maybe if it is all MIDI it doesn't decrease the audio quality. :)