Just to let you know... I finally found the time to fill in these items at Discogs which were absent there before:

I Wish U Heaven, 12", purple
I Wish U Heaven, 12", blue
Batdance, 12", clear (with label)

A few months before, someone else already added the white label (label reversed) version of Batdance.

At prince.org and Sleevographia they are referred to as test pressings, whereas the rules at Discogs only qualify a release as a test pressing if it is marked as such (e.g. those from Specialty Recordings). Since the information on their history is very scarce - to say the least - any additional facts are welcome. My copies are different from those at Sleevographia, neither have they been bought at eBay (see eBay history on Sleevographia).

Judging from how rarely they pop up for sale, I'd say that a maximum of 5 copies of the purple version, and another 3-5 copies of the blue one have been manufactured.

One striking fact that I haven't seen being discussed before, is that all three of them (including Bardance) have been manufactured at the now defunct UK pressing plant Adrenalin. Other UK12" releases have been pressed at Damont (IWUH), and at Damont or Orlake (Batdance). So, if you happen to have a contact of a former employee of Adrenalin you know what to do.

[Edited 9/23/18 3:32am]

xenophobia2002 said:

I am still looking for the I Wish U Heaven purple vinyl

I guess you have seen my message on Discogs?

Update: Digging deeper into Discogs, I've been able to identify the person who cut the plate for the coloured IWUH 12"s at Adrenalin. It is Peter Lawrence:

https://www.discogs.com/artist/2517533-PAG

I haven't been able to find a contact though.