1. Open the Shortcuts app and add a new shortcut by tapping the plus icon in the upper right corner

2. Tap the Add Action button

3. Tap on the Scripting option

4. Tap the Open App option

5. Choose an app

6. I've chosen 1Password as an example. Now tap on the Share icon at the bottom (2nd from right)

7. Tap on the "Add to home screen" option

8. Tap the icon and it'll bring up the option to choose your icon — you can choose from your Files app or Photos app, depending on where you saved your icons

9. Tap on "Add" in the top right and it will add it to your home screen

10. Tap on "Next" in the top right

11. Give your shortcut a name and then tap on "Done" in the top right

12. Done! Now rinse and repeat for every icon