I've considered doing this to my newly acquired Model 3... went on ebay to look at homelink module prices and just laughed. Some of these crackheads want $400 for a used module (and multiple posts for $350+). The cheapest is $150 though, not sure I'm ready for this potential headache, but I got so used to Homelink in my MY that I feel like an animal pressing a button on the remote.
My car is still new so I'm still debating what to do.
It's pretty simple to install. Here's a video of me doing it on my model y: