Having just done this this afternoon, it wasnt all that bad. About a 30 minute job now. What I did was:
1. Remove the hood/side panels, fuel filter holder, air intake horn, IAT sensor, secondary clutch and belt.
2. Disconnect the electrical connections from the ECU and the lines that run under the oil tank, remove the clutch guard and balance it on the primary clutch for now
3. Remove the fuel line with the fuel filter from the fuel rail and tuck it up by the handlebars.
4. Release the air box clamps and sneak the top under the remaining fuel line that is connected
5. Remove the air horns
6. Reconnect the fuel line and set the clutch guard back into place, reconnect all Electrical connectors (just set the IAT sensor and horn on top of the engine)
7. Start the engine, bring it up to temp and fog the engine
8. Disconnect the electrical connections and clutch guard
9. Remove fuel line
10. Install air horns and airbox top
11. Reassemble all the crap you took off.
12. While your in it this deep, take the time to grease the Jackshaft and driveshaft while the clutch is off.
My thought to address this on a more permanent bassis is to put grommets in the airbox above the TB's and run the same size tubing that the chaincase breather uses and postion it above the TB so in the future you could fog the engine by spraying fogging oil into the breather line. A hose splice would seal the hoses up and keep the airbox sealed. Future service would be a cake walk after the intial agony of disassembly to install the grommets and oil feed lines.
I'm showing Ebay links because it was the easiest visual reference, I'm sure all of these parts could be had at your local parts/hardware store.
Here is my preliminary Parts list:
Oil Line x 2
http://www.ebay.com/itm/YAMAHA-DT10...49?pt=UK_Motorcycle_Parts&hash=item35b85c2521
Grommets 7mm should be OD on the oil line
http://www.ebay.com/itm/F02028-7mm-...998?pt=LH_DefaultDomain_0&hash=item20c063c72e
Hose splice to connect oil lines when not in use
http://www.ebay.com/itm/2pcs-3mm-6m...Parts_Accessories&hash=item3a6a2d6b76&vxp=mtr