No, Kanz. Blazing Arc is a power, not a property. The firewind blade procs on hit and is NOT a power.
Read this again. Here, quoting and bolding so you can see it:
'you must choose to use the enhancement bonus, properties and powers of the ki focus, rather than the weapon you're wielding, or vice-versa'
EDIT: In other words, you don't cherrypick. Use a fraction of the magic item, be it a focus or blade, and you gotta use the whole.
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Twostuck, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/62168402