Hello!
Many Steam trainers work for the Epic version of the game too. All you need to do is click the Fix button you see in the trainer and manually link the Epic version’s exe file. This information is found all over the community via the search button. 
Trainers are made for each platform based on democratic popularity in the community, not just because the game exists there. Read more about that, including how to improve it’s chances, here: Vampyr for Windows suggestion - #2 by Ravenfyre.