In December, I want to travel to FRA or BRU from Houston. Since it's my wife's birthday, I want to do it big (think Singapore FC). There appears to be no United FF tickets from IAH to either FRA or BRU that show a SQ61 in the mix.

However, Air Canada shows the IAH-DME flight with connecting flights to FRA and BRU. The problem is that FC/Biz is only for the second flight, not Singapore flight. Getting a second ticket from Moscow to BRU or FRA doesn't seem like a good idea because of customs, security, and baggage issues.

Any way to make this work? I called Singapore but they said impossible.
BTW, I am NOT interested in traveling to JFK to fly Singapore. I have points with United , AA, and Amex.

Thanks