LE/SE hatch proximity / Smart key unlock research

I have a Prime SE and the only feature of the higher trims I miss is the proximity open on the hatch - have to click the remote to unlock the car before being able to open the trunk.

So I dug up and 6yo thread with a PDF guide for a Gen 3 on how to add more unlock buttons and found some compatible part numbers off XLE/XSE, so it's been done before, just not on Gen 5:

84840-47040 - hatch button assembly
89997-0E050 - rear Smart key antenna

Prime SE button assembly harness has 3 wires coming out of it already (while the button assembly itself only has 2 pins, so hope is that unlock button will work out of the box).

Antenna is harder - if there is no pigtail around the bumper, I'll have to figure out where to wire it - have zero idea how at this point.

Once new button assembly comes in, I'll test it on its own hoping that placing keyfob near driver's door will be enough for the proof of concept.

But if anyone has access to wiring diagrams or any sort of shop manuals, I'll be the guinea pig.

Anyone with me?