Finding nobody has already done this (?!?!), I made a kitsun.io deck for hiragana and katakana.
https://kitsun.io/store/detail/5cfd6152d8266662b258e3fa
note that i used “ji” and “zu” for ぢ and づ.
i’m adding the yoon as we speak.
This is what I wish wanikani had as an optional level zero… anyway, I hope it’s useful to some of you. Please let me know if you see mistakes or things I left out.
I’m also surprised that nobody built that already, so good on you for making it! But why would you use ji and zu for ぢ and づ?
What do you prefer? There seem to be multiple approaches to those glyphs.
While it may or may not be intuitive, the standard way of typing ぢ and づ into a Japanese input method editor (IME) is di and du, because ji and zu produce じ and ず. If someone plans to learn to type in Japanese, learning ぢ and づ as ji and zu would lead to problems.
I think dzi and dzu would be more intuitive than di and du, but dzi and dzu aren’t accepted by all IMEs.
@Ilyasaur you’re no longer needed 
It was bound to happen eventually 
Prototype deck likes forever abandoned.
Yesyes but it is my understanding that the glyphs are nevertheless pronounced the same way as their ‘z-row’ counterparts.
I guess I will see if kitsun.io will let me put alternate answers, it probably will
What does this mean?
Just that I noted the lack of beginner material also, started creating a kana deck but never really fleshed it out. It was more of a concept than a serious attempt at building a complete deck.
Oh no i stole your idea i hope you don’t sue me 
In standard Japanese they are pronounced the same, yes, but for WK users, knowing how to enter them in is important. The letters used to represent them in romaji don’t imply a sound change here.
I agree with Leebo, it’s important to rectify that. And don’t worry about the deck. Education is free and I don’t have copyright on the concept. I may still make one some day for my own purposes, and if I choose to publish it, may the better deck propagate 