I GOT IT GOING!!!
The keyboard hack file I got must've just taken a few tries to get it to work, but I'm playing Super Chef Burgertime as I type, and it's so much fun! This is exactly how I dreamed it would be- exact graphics as the original, fun, and challenging but doable. The keyboard controls suck terribly, but I have no knowledge of computer language to create my own custom hack file, so I'll just have to get used to it for a bit. I kinda feel like a freshman student in Computer Science walking into Senior Thesis here, lol. However, I do have two original controllers from my dad's master component that I took out of the console literally a week ago, and I plan to order a set of USB adapters from https://www.raphnet-tech.com/products/intellivision_to_usb_adapter/index.php later this week. The site even includes the hack file I need to use the controller, which should save me some potential brain damage.
Thank you guys so much for your advice, help, patience and welcoming me here! I'll keep you updated on how things go with the adapters