Refokus Tools CMS Prev/Next, Custom Order Of Projects


I am using the Refokus CMS Prev/Next Tool:

Here the link to the Refokus CMS Prev/Next Tool JavaScript:

When I click the previous or next button it will show the next or previous collection item/project, in the order how I see the collection items in the CMS. However, on a project overview page I am using a custom sort order for my collection items/projects. I gave every project a custom number and set the sort order to “Largest to smallest” to display them in my custom order. Is there any way to respect my custom sort order, when clicking on the previous or next button?

Unfortunately I cannot show a preview/read-only link of my clients website.

Thanks a lot for your help!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)