I did the gravity feed line with a small reservoir on my 1000 when I did the delete. I filled it every couple rides, but this season I found a bad seal on the water pump shaft and upon closer inspection found brass shavings in my crankcase. The brass gear that drives the water/oil pumps was going bad. Luckily I caught it before anything else got wrecked, but I would say that I had less than 1000 miles on the delete. There are about 3000 miles on the motor, but I don't think the gear should have gone from normal wear and tear in 3000 miles.
It seems to be a little bit of a crapshoot whether or not your motor will do well with the delete. There are a lot of guys that have thousands of miles on the delete and there are a lot of guys that have issues with that drive gear.
I am going to keep the delete in place because I like how the engine ran with it, but I am drilling the upper case half to get oil mix into the drive cavity. If I were to do it over again I would probably drill the drill the bottom of the case and run the tube in between the two banjo fittings like the twisted turbo setup. That can be done without splitting the case and there is a pretty good track record with it.
Here is a thread with the kind of setup I am talking about. I have heard of guys doing this without splitting the crankcase by drilling from underneath and being careful to get as many of the shaving out as possible.
http://www.snowest.com/forum/showthread.php?t=166262