Qantas website gives an advance purchase fare of $1875 return to Frankfurt for next October (from Oct 4).
Return fares to LA are around $1900. To Dallas, still $2277 but I seem to remember that that dropped to around $1800 around this time last year.
This is relevant because round-the-world fares with Qantas start at well over $4000.
It would be cheaper to fly to Essen, fly home and then fly back for BGG.con – although we wouldn’t get the amazing baggage allowance. (20 kilos per passenger in or out of Australia, compared with 2 bags, each up to 32 kg, in or out of the US. By flying home through the US, we would get a whopping 44 kilos extra baggage allowance EACH).
It is possible that “divide and conquer” might be a valid strategy.