CD keys websites sells it for around 350 and 700 euros if you're interested, i even saw some price around 1599 E. That's totally crazy.
More seriously if it was possible to extract the game from Football Life that would've been done since a long time, but they replaced too much things, i don't think in the core of their patch the game is hidden and intact.
I got the same issue, i brought it on console as my older pc wasn't good enough to launch PES 21 on 2020 release... But i didn't see coming what's next as no one here.
If we were aware of the removal of not only PES 2021 but all their versions, i/we would have buy a version in security for the future when i will brought a new PC.
That's life mate

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The only alternative is Football Life is free and based on PES 2021 as a core, i saw some game and they changed some animations from what i saw, as it's the Smoke patch in fact there's nothing like fakes names, kits or whatever else.
Now the gameplay, controls and all shouldn't be that much different as the basis is the same, probably better as they worked on that basis since years. But they patched some stuffs here and there, and textures, aswell they got much more presets faces or Stadiums..
I don't know i will discover it when i finally get "access" to my new PC, for the moment there's too much things i'm working on the old one. It will takes months to transferts everything.