There’s maybe some confusion about the terminology. There’s a strict definition for radical and a loose definition for radical.
The 214 radicals are the strict definition. Each kanji only has one radical. They are used for cataloging kanji and determine how kanji are ordered in a kanji dictionary. The Japanese government gives schools the information they need to teach to kids on kanji and this is one element that gets officially defined.
The WK radicals fall under a loose definition. These are more like the parts that make up a kanji and have no official standing or categorization.
If you want a tool that converts kanji to WK’s radicals, you need to use something related to WK, because no one else will know what you’re talking about.