Stealth Audio Player can do exactly that. There is "Activate for ALL APPS" option.
Android
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I'm not sure Android 8.1, or your Blackberry, has this feature, but i did this once by setting audio to 'mono' and let everything go through the left speaker (which is the top one, in my case at least). Try searching for 'mono' in your settings and see if it's there.
Edit/note: i think this also applies to external audio devices, you might want to change it again when you use headphones etc.
Hi Feddinat0r,
Enable developer settings and explore the audio settings in there, there might be a way to get that done, or it might only be limited to Bluetooth.
Also, this app isn't quite designed for this issue but maybe take a look into BTCarMono Mono BT Router. I used it in the past until I fixed the issue I had with a Bluetooth device. Also, I'm not sure it's compatible with your phone running such an old version of Android, you'd have to test.
Good luck!
I think back in the day, I used a Play Store app called earpiece, which did this. Not sure if it 100 % meets your demands, but worth a try