If you don't require that the unit are able to shoot the bow, it would not be too difficould to add a bow to the warden (campaign non-hero version), and perhaps change the skin a bit.
Post it here in the request section next time you have a request.
I just checked again. The Campaing non-hero Warden looks almost exactly like the Human Infiltrator pic. It just lacks the sword, but you can easily add a sword with an orb ability. Use it as it is, or request a skin for it instead.
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