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In my case, this is a board that I'm designing that will eventually be a product.
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There-in lies the difficulty with Altera/Quartus not support user-defined USB-Blaster interfaces.
How can you sell a product containing a USB Vendor ID and Product ID that you do not own?
Perhaps Thomas (Altera forum user ttentner) can answer that, since his company sells an EEBlaster product ...
http://www.entner-electronics.com/tl/index.php/eeblaster.html I recall Tricky mentioning in another thread that you can license the USB-Blaster. If the license fee was reasonable (say $5/board), then that still might be a cost-effective option.
Cheers,
Dave