I cycled in from Attadale up to the river just past Bendronaig. Didn't go round to loch Calavie but straight up Bidein a Choire Sheasgaich head on, then on to Lurg Mhor back down to the bealach and down to the loch then a short walk and long cycle out with a fair bit of uphill section to start with.
Including the driving we left Inverness early in the morning and were back in Inverness 13 hours later which surprised me a bit as I'm not particularly fast.
I guess these munro are not as remote as I first thought, easily doable in a day but an overnighter would be better.