Resurrecting and old thread, but SpeTool on Amazon has 1/8" O-Flute carbide bits in 3/4" (5pack $25) cutting length. Since they are single flute they don't pack up with chips as bad. You would have to do fairly small stepdowns or the bit will snap.
https://spetools.com/collections/o-f...g-diameter_1-8
I've never used their site since the prices are higher than Amazon but their shipping policy says $6 shipping to Canada. https://spetools.com/pages/shipping-policy