It sounds like you already have a good handwriting tool, but if there's a problem with it, https://chineseinput.net/handwriting.html can also be used for handwriting input.
I've used zdic from the previous answer and think it's a great resource. However, sites like that can also be quite slow to load and use a lot of memory.
http://dict.tw/ can be loaded quickly and can return cangjie codes (for versions 3 and 5) without much time or memory usage.
Sample output from dict.twhttp://dict.tw/ with Cangjie codes pointed out :
贏
【注音】 ㄧㄥˊ 〔U/6〕
【大易】 立女口點 〔KLO.〕
【大易】 立女點 〔KL.〕
【倉頡】 卜口月月弓 〔YRBBN〕 <---Cangjie 3
【倉頡五代】 卜弓月山金 〔YNBUC〕 <---Cangjie 5
【行列30】 6⇡7⇡7⇣6- 〔YUMH〕
【行列30】 6⇡7⇡7⇣4- 〔YUMF〕
【行列30】 6⇡7⇡7⇣1⇣ 〔YUMZ〕
【四角號碼】 0021
【電報碼】 6366
【大五碼】 C4 B9
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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典
贏 [ㄧㄥˊ; ying2]
to beat
to win
to profit
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I've pointed out the cangjie results above in the block quote.
Hope that helps.