I got a little carried away... and since your patience is short, I'm posting what I have done, although its not finished. I'll try and update it and have more done soon, but I can't make anything small or basic and can't help the need to make it complex.
This has 6 plugins built into it. Three for timers by the scripter Orange (so that the timer is hidden), and three from Yanfly which do things like add Dynamic message boxes and lock certain equipment (like preventing your underwear from being removed).
I made two things of note.. first, there's a 'make your own character' option. You can choose male/female, one of three skin colors, and one of three hair colors. It even stores your name and picture. This still needs a little work since right now it just stays with one face and doesn't dynamically switch to other faces for different emotions (like surprise and shock) when you're having accidents. The event is on the doll in the nursery if anyone wants to look.
Second, the potty script basics are there. Check the common events. I've only finished guys right now and only for wetting. You can click the tamberine in the nursery to increase your need to pee by 5 and to see what the current need is. I left comments in the common events to explain what's happening. If you want a complete script, you'll have to wait till I finish it or use what I started and fill in the rest.
Things I did't add but need too:
-Girls accident script.
-A negative effect for each accident (potty ability goes down).
-A value for each underwear type (panties can hold 20wet, while a diaper can hold 90. Go over the value = leak).
-Leaks = Puddle on the ground.
-A skill to feel if you need to go to potty.
-A skill to just let it go.
-A skill to check underwear.
-A toilet / training potty you can use to decrease your need to go.
-A positive effect for successfully using the potty (potty ability goes up).
-Being able to change your underwear to something other then diaper at the dresser.
-An NPC who periodically checks your pants or invites you to try going potty in the bathroom.
-Crinkle noise when you walk and your diapered.ABDL Toolset MV
The current version of the momsterous script is like this, but more complex and specifically for Mira (as in her faces, vocal patterns and emotions). It includes another variable (WetHold, MessHold) that makes it so not only does she have a stat on how well she can tell she needs to go she has a stat on how well she can hold it. And it also includes varieties of different 'accident' texts so its not just always 'Mira wet her diaper'. And it also offers the option to give up on trying to hold it if you need to go.
Another thing not in this toolset demo is my Momsterous Sprites. I have sprites of Mira doing a potty dance, or suddenly having an accident and her dress gets wet, or getting changed lying on the changing table or mat. Pics of her on the toilet or potty. Etc etc.