What exactly are you asking for here? What URL needs to redirect to where?

Example: https://incubator.wikimedia.org/wiki/Wp/lrc/سرآسونه →‎ https://lrc.wikipedia.org/wiki/سرآسونه

How would you view the original pages on Incubator if this is implemented?

There exists the message wminc-error-wiki-exists that shows a link to the page in the subdomain. Example: https://incubator.wikimedia.org/wiki/Wp/mai/सम्मुख_पन्ना shows (wminc-error-wiki-exists: mai.wikipedia.org/wiki/सम्मुख पन्ना)

What I suggest is to make wminc-error-wiki-exists more apparent (maybe in a box) and suppress noarticletext-nopermission.
@Hydriz: As there seems to be a middle-ground already, the change shouldn't be hard to implement. The problem is that interwiki redirects do not seem to be supported (soft-redirects).

@Glaisher: What do you mean? All the edit history of pages moved to a subdomain is retained, viewable on the subdomain. There would be no reason to look at the original pages. Furthermore, the pages are deleted on the incubator after they are moved off.

@MF-Warburg: Kimberley-nia Bot hasn't deleted the pages of wikis since Wy/zh. The bug report would effectively be resolved when the pages on the incubator are deleted.
These are the wikis whose pages aren't yet deleted:

• http://incubator.wikimedia.org/wiki/Wy/fa
• http://incubator.wikimedia.org/wiki/Wp/mai
• http://incubator.wikimedia.org/wiki/Wp/gom
• http://incubator.wikimedia.org/wiki/Wp/lrc