I recently smashed up a mirror, and haven't had the $100 or so to replace it.
I briefly tried mounting using the handlebar studs, but the mirrors would bump into the windshield, which restricted steering. I could have went with bar end mirrors, but didn't like those and they were more expensive than the mirrors I went with.
Instead, I mounted mirrors very similar to these (mine are black though):
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=200624687055+&lgeo=1&viewitem=&clk_rvr_id=245325770408&vectorid=229466.
The C10 Mirror is held to the frame mount (where the accordian rubber meets the piece on the front fairing) with a single nut and two 'stays' to keep it from rotating. Removing the fairing mount can be done with some patience, by removing the windshield and then working a wrench between the shelf and fairing plastic. Two bolts hold the mounting to the fairing. There are two other bolts for a fairing reinforcement as well here, but you don't need to loosen these. If you end up taking all four nuts off, no harm will be done, btw.
I then took the fairing mount piece to the local nut and bolt supply place, and found a hex head bolt that would fit through the hole on the mount, with enough length to 'double nut' on the other side.
I then bought a pair of 3/4" conduit holders:
http://www.homedepot.com/h_d1/N-5yc1v/R-100119654/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053.
I drilled a suitably sized hole in the end of the curved part, and oversized the hole at the flat end so the bolt I had chosen would fit through the strap.
I used the first nut to lock the bolt into place in the fairing mount. Due to the fact I couldn't get a longer bolt to fit, there is no washer in place here. I then used a 'locking' nut to hold the strap in place between the two nuts.
I then re-attached the fairing mount to the front fairing. Note: this would be much easier if you removed the dash shelf, but I'm stubborn that way...
Then I bolted the mirror onto the conduit strap, and bent it appropriately to the right angle. At some point, I'll find something more stylin' or paint the strap black...
The bendability of said straps have saved my mirrors on two occasions now, when the bike has went down. The mirrors I bought have a 'ratchet' feature that allows the mirrors to fold up, and the strap also bends a bit to allow the mirrors to bend further out of the way.
My main complaint with said mirrors is that they have a smaller surface area than the C-10 mirrors, so you see less. At some point, I may find bigger mirrors or pony up for an OEM replacement. They do look more sporty, though, although I am feeling the need to find a more stylin' piece of metal to replace the conduit straps.
I'll post pics at some point, but this should give you an idea of what's possible. The main point is that you can use a single bolt at the fairing attachment point to attach them there, with a suitable piece of metal to change the angle as appropriate.