Translation notes:
Pippi Langklomp = Pippi Longstocking = Mymy
Sinterklaas = Dutch Santa Claus
Pakjesavond = Package Giving, Like Easter Egg Hunting but for Christmas
Surprises/Klassensurprises = Like a Secret Santa but You Draw Lots Based on Self-Submitted Interests and the Recipient Guesses Who You Are From a Satirical Poem You Write and Arts and Craft You Make (I translated this as "Christmas Party" but really shouldn't have)
Loempia = Thin Indonesian Spring Rolls
I understand why Massa thinks the comics are in poor taste. This was really dark and gave a perspective on Maya's character that a cartoon would never touch on. It's not bad, but it describes a young girl going through a fairly realistic downward spiral from bulemia into anorexia. Given how we now have everything Ongezellig, I imagine the timeline like this.
>First Meeting
>Propaganda
>Coco's Birthday
>Maya's Order
>Coco Rugby
>Mymy Korfball
>Maya's Sweet 16
>Maya's Stream
>MayaMail
>Maya's Conversation
>Ongezellig
>Mymy Wanted
The sequel to Maya's Conversation would be before Ongezellig. As for the scrapped future episodes, I think the right order for them given this timeline is.
>Class Representative Elections
>Coco Cures Bullying
>Maya Becomes a Band Member
>Mymy Conquers België
>Maya's Friend
>Queen Mymy
>Maya's Cat
>Mymy Versus Santa Claus
However, I think something about Ongezellig (the episode) doesn't match the timeilne unless Massa planned for the series to run for one or two seasons. Since Ongezellig is set after MayaMail, the series would have be a school year and a half since the characters are 16-17 when the series would have started. I doubt the episode ideas he gave could make an entire season, but from his proposed episodes alone, the pacing and character focus would be too skewed toward Mymy as 5/8 of the episodes are Mymy episodes. I would have put Queen Mymy at the end, but ending on a holiday special is a cartoon tradition, and Maya's Cat back-to-back with Maya's Friend would make the latter half of the season too drama-heavy. Either of them would be a good mid-season finale or season finale, depending on whether Mymy's sister would have been a regular character. Coco Cures Bullying could be about Adam, who has a threatening design and Massa didn't think of a gimmick for, and that would leave a spot for Mymy's sister.
I think that even if the series was picked up, it would have turned into the Dutch Moral Orel.