Hi marcel-x
welcome to this Apple (user-to-user) Community!
Re: "Safari website icons missing in Assistive Access
"The website icons do show up on the home screen in the regular access mode"
That's a great start!
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Re: "How do I select website icons to be placed on the home screen in assistive mode?"
Am no expert in this area, yet your question deserves some response:
Wondering whether Apple Support's online article (link below) can help you add, and customise Safari to suit:
(Sorry have no iPad available to check this out for you.)
See: Add, remove, and customize apps for Assistive Access on iPad - Apple Support
Eg: says:
" ... you can add apps that are specially designed for Assistive Access, like Calls, Camera, Magnifier, Messages, Music, and Photos. You can also add other iPadOS apps in their original form."
Add or remove apps for Assistive Access
- Exit Assistive Access if it’s active.
- Go to the Settings app
. - Tap Accessibility, then tap Assistive Access.
- Tap Manage Apps.
- Do any of the following:
- Add an app: Tap
next to the app, then choose options for the app. - Remove an app: Tap
next to the app, then tap Remove. - Change the order of apps on the Home Screen: Touch and hold
next to an app, then move it to a new location in the list.
Change options for apps in Assistive Access
- Exit Assistive Access if it’s active.
- Go to the Settings app
. - Tap Accessibility, then tap Assistive Access.
- Tap the app’s name.
- Choose options for the app."
Else: if the desired result is lacking from that method, (or from others who may yet contribute their experience)::
You may want to reach out to the experts on Apple's Accessibility Support team:
See: How to contact Apple for help with accessibility features - Apple Support
All the best :-)