I do not get your question completely, but there is a bunch of usefull userscripts that will:
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Show upcoming reviews:
[Userscript]: WaniKani Ultimate Timeline -
List all apprentice items grouped by level:
[Userscript] Dashboard Apprentice -
Allow you to run drills outside of WaniKani SRS on items of your choice, including leaches:
[Userscript] Self-Study Quiz
Hope it helps.