Request ... Does anyone take requests to insert Gameshark codes in N64 games
 

Does anyone here know if there is there a tool that will allow us to apply game cheats to a N64 (.z64) or PS1 BIN file, this way when we run the game, it already has the cheats enabled and embedded?

For example an app similar to this utility for:
* ‪Game Genie Guy (app)‬

If not, is there a guide to accomplish something similar either with HEX editing or something?

Interest ask. But maybe the simple HEX editor is suitable for your task?