I could be wrong here, but on the hondas with eccentric chain adjustment, cant you install the bearing carrier on the axle and then slide the whole assembly through the swingarm from one side???????
That way you pump the grease in the carrier with axle already installed in the carrier before you slide it all into the swingarm.  On my 85 R, it slides in from the sprocket side.  then you can put on the brake hub and lock nuts on the other side after sliding the carrier and axle through as a unit.
You couldn't add grease during routine maintenence with-out dissasembling it though.
				
			 
			
		 
			
				
			
			
				1986 Tecate
1984 Tecate
1985 Tri-Z 
1986 ATC350X
1985 ATC250R (2)
1985 ATC125M (2)
1982 ATC70 - Original Owner
175 TriMoto Frame with Pro-Tec Rear Suspension
3-Wheelin' since '82