"Borrowing" Elements

[ItsCliffGaming]

How difficult would it be to borrow an element from something like "Savage Worlds" and using it in "5e" - Like the Bennies system, or the Adventure Card System? Is this allowed- for one- and for two, are there any mods that can add individual elements like this?

[damned]

You have the Advantage System and Inspiration in 5E. Use Inspiration to track the players Benny pool perhaps.
Sure you can do a full Benny implementation but that will require you to go coding.

[LordEntrails]

If you are going to borrow code, please ask and give credit. And of course, folks always appreciate it when you share your creations