From Bealach Ratagain and Moyle
The SMC's 'Corbetts' guide book briefly mentions alternative routes coming from the north-west.
If you had been hillwalking up Beinn Sgritheall, or coming over from Skye via Glen Elg, then the approach from Moyle would be recommended. This starts from near the campsite in Glen More and heads up a path to Loch Coire nan Crogachan. (Green route on map)
Another alternative could be starting from the high Bealach Ratagain, however the route appears pathless and undulating. (Blue route on map)
Unfortunately I have not been up this hill from either of these directions, but hope to soon. In the meantime you can find a link to the SMC Corbett book under the 'Route info' tab.