Well I did end up buying a 16" 36 spoke rear rim and front hub from a member on this site and just received it on Monday. I sent a email to Buchanan to ask them about getting spokes for this setup. Below is what they said:
We can determine the spoke length no problem. the only problem that we can see is that the drilling angle of that rim will not match to the smaller diameter front hub. once the wheel is laced and trued, the spokes will be bowing. If the rim is aluminum, you might be able to re-angle the holes to work better.
I am hoping that reworking the holes isn't to bad. Does anyone have suggestions or experience with doing this?