The instructions you mention are how to do it. Or, at least how to create the collections on the device.
But, what you use for setting those collections is up to you. You can use any column or combination of columns that are in your calibre library. A collection will be created for each value in the columns. Or, in the case of tag-like columns, each tag. Just choose the ones that suit you. Or create another that produces the values you want.
And no, the collection column in the details list is read-only for the Kobo devices. It shows what collections are on the device but isn't used to set them.
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