I think I found out that an alternative version of "Princess Lumpenella", other than the one in Tiger Books" was published in Young Magazine. This news page announces that it was made public in 2010 for a limited time in digital form to celebrate the 30th anniversary of that famed magazine, but at that time I didn't even know about this work.
Anyone happens to have a digital copy of that? I got the Tiger Books version, but I only got a couple of pages of this alternate version.
Thankies!
Edit: I found this,too. It seems that even in Japan it's a hard-to-find item
MOAR Edit: Tried with Wayback Machine and the online comic reader Crochet. Failed miserably.