Im curious, how is what you outlined different from HouHou (great tool).
The only difference that I see that it has core 10k imported, which you could do by choosing to import it into to HouHou - and im guessing this will be on-line service… I perfer one time fee’s rather than a reoccuring subscription - life seems to becoming about subscriptions - games / videos / music / others - I like to actually buy and own a thing and would be more happy to purchase app for android or windows… If you would be open to it, i wouldnt mind an android app.
If so, then frankly I dont think this application would be for me. I like HouHou how you can search a word, add it to you’re list and learn the word through the wanikani approach. (Though i wished the text box was bigger, maybe will be in future - but not a big deal).