Since it's not in Fedora, I figured I'd package it quickly in a Copr, so he wouldn't need to install it manually.
And then I realized I had never actually announced it to others who might be interested, so here it is:
You can install it as follows:
$ sudo dnf copr enable bochecha/playitslowly $ sudo dnf install playitslowly
Let me know if you find any issue, or if it's useful to you.
And if you're interested in having this in Fedora proper, feel free to grab my spec file and submit it.