Just ran into this particular issue myself. I was due for an oil change so I went ahead and drained the oil. I then used a hook from a pick and hook set to pull out the old seal. I then slid the new one on and tapped it into place with a wooden dow rod around the edges. 100 miles this past weekend and no leak. So yes, you can replace it with out removing the clutch cover.
2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.
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