The good news is that your proposed trip is easily converted into a OneWorld RTW, and that the cost of the RTW ticket in business is almost surely less than a point-to-point ticket in Economy/WT+.

The bad news is that once you find out about the various options you’ll have, the more you’re likely to go bonkers planning the trip.

The simplest thing is a DONE3 – that’s a OneWorld Explorer, or RTW, in business, hitting 3 continents. The price is €5999 plus taxes. The simplest itinerary would look something like this:

• SNN-LHR-PHL (you could theoretically also go SNN-BOS on EI then BOS-PHL on AE, but that would be a stultifyingly stupid thing to do).
• PHL-SEA via ORD or DFW
• SEA-JFK-HKG-PEK (you have to get to HKG as that’s the only gateway to PEK on this fare, but you’ve got several other, less desirable options, all beginning with SEA-DFW. You could then do DFW-NRT on AA and then to HKG on CX, or DFW-SFO or DFW-LAX and then CX to HKG)
• PEK-LHR-SNN

Now, if you had the time and inclination, there are several side trips that you could schedule along the way (Bali, Puerto Rico, Dubai, etc), but that’s where the bonkers bit comes into play.