As far as I am concerned, I prefer anything not directly related to the translation to be somewhere else: in comments, in fans' discord group, on colorer's page, wherever. A simple phrase "we've got some colored images for fans here here and here" on the credits page should be more than enough
Me personally when I start reading the chapter on MD I look at page number, to have an approximation of when the chapter is gonna end. And I have some expectations based on that. If there's a lot of non-chapter pages at the end, it feels like chapter abruptly ends, and this is not a pleasant feeling. Though I should admit this may sound autistic to you, I'd prefer to not experience this situation if possible.
Of course you are not forced to follow my wishes, and are free to do anything you want. But you do understand that you inevitably get a scornful look from me in this case, right?)