We would be interested in this concept too.
Having the same problem here: simple page link field (acf-field-page-link) search works for native pages and posts, but the search field doesn’t work for custom post types.
No not my work, but I’m loving it. The add-on is made by Thomas Meyer.
Same answer as for your other post:
Did you try this add-on?
https://github.com/tmconnect/acf-relationship-multisite
For cross-linking this is the perfect solution. You can either return the post object of ID.
The only downside is that you can only select one subsite per field. So you would need to create a multisite field for every subsite you want to gain access to.
Did you try this add-on?
https://github.com/tmconnect/acf-relationship-multisite
I think in your case you would use just this acf-relationship-multisite field instead of the image field. I’m using the add-on to get post objects and show the permalinks, featured images, titels, etc across subsites.
The only downside is that you can only select one subsite per field. So you would need to create a multisite field for every subsite you want to gain access to.