Tutorial: Native dual-analog and widescreen for Perfect Dark and GoldenEye 007 in Retroarch (No hacks)

This is based off a tutorial I made for Mupen64 Plus on an Android based handheld, but since I got a steam deck, I wanted to get it working in Retroarch as well.

NOTE: This tutorial uses Retroarch installed via EmuDeck.

Step 1: Prepare the Games

First you need to change some in-game settings in both games. Specifically the control scheme and aspect ratios.

In Perfect Dark
Make your save file, then in the pause menu, scroll to Options > Video

Set "Ratio" to 16:9.
Turn on Hi-Res if you need to.
(Back to Options) > Control
Set Control Style to "2.4 (Two-Handed)"
Reverse Pitch: [OFF]

In GoldenEye 007
(You actually need to start a mission and bring up the pause menu.)

In the third tab, change control style to "2.4 Goodhead"
In the next tab over, set Look Up/Down to "Upright"
Further down in the same tab, change Ratio to 16:9

Step 2: Switching to Widescreen

(This assumes you set 3D games to "4:3" from EmuDeck. I'm not sure what effect having that already set to "16:9" will have on this process. However, if it is a problem, you can probably just skip this section and go straight to the next one for controls.)

While in either game, hold the select button and press Y to bring up the in-game Retroarch menu.

Navigate to Settings > Video > Scaling.

Change Aspect Ratio to 16:9, or 16:10 if you want to fill in a little more screen and don't mind a little vertical stretching.

Step 3: Remap the Controls

(Don't worry about these changes. We will save them to their own profile so they won't mess with other games.)

Go to Settings > Input > RetroPad Binds > Port 2 Controls.

Change the Device Index to "Steam Virtual Gamepad" (Or otherwise the same controller as Port 1).

Navigate to Quick Menu > Controls > Port 1 Controls

Disable the R2 button by switching it to "---".
Disable all four Left Analog functions as well.
Remap all Right Analog functions from "C Button" mappings to their equivalent "Control Stick" mappings. (For example, change "Right Analog Y- (Up), Axis -3" from "C Buttons Y -" to "Control Stick Y -", then do the same for the rest.)

Exit and switch to Port 2 Controls

Disable L2 Button
Change R2 Button to "Z Trigger"
Disable all Right Analog functions.

Step 4: Save Your Settings

Exit Port 1 Controls and go into Manage Remap Files

Select "Save Remap File As" and give it a name you'll recognize. (This is to make setting up the controls in the other game faster. I chose the name "goldendark".)
Next, select "Save Game Remap File".

Navigate back to Quick Menu > Overrides

Select "Save Game Overrides"

Step 5: Setup the other game using your saved configurations.

Launch the other game & open up the Retroarch quick menu.

Navigate to Quick Menu > Controls > Manage Remap Files

Select "Load Remap File" and choose the one you created. (goldendark.rmp for me.)
Select "Save Game Remap File".

Navigate to Settings > Video > Scaling

Change "Aspect Ratio" to 16:9 (or 16:10).