Finding eight rooms in the Glencoe region at this late date is going to be pretty difficult! If all else fails, you could try Fort William, as Wasleys recommended, which is not that far from Glencoe. There are a few quite large hotels, and you may be able to find something there. Your group may have to split up, but Fort William is not that large. The Premier Inn isn't too bad, and is relatively centrally located. You could also search for Air B&Bs.
The National Trust for Scotland (NTS) office in Glencoe doesn't arrange accommodation, but you can check out their website for ideas of things to do and see in Glencoe. www.nts.org.uk/visit/places/glencoe You will find that you can allot as much or as little time there with which your group is comfortable.
You could try contacting the tourist information office in Ballachulish directly for accommodation recommendations. They are not part of the national TI group, but it's worth a try. The telephone number from the U.S. is 011 44 1855 811866. You could also try the official TI office in Fort William. That telephone number is 011 44 1397 701801.
The "Road to the Isles" is commonly considered as the A830 between Fort William and Mallaig. It's a beautiful drive, especially after you pass Glenfinnan. There are many gorgeous beaches, and several good places for a hike. Especially scenic is the B8008 parallel road from Arisaig to Morar.
You and your companions may be interested in the Traigh golf course near Arisaig. www.traighgolf.co.uk/course-guide It's a nine hole course, but you can play 18. It's par 68 for 18 holes. 20 pounds for a round, and they do rent clubs if you didn't bring your own. The course is in a beautiful location.
As with Glencoe, you can allot as much or as little time to the "Road to the Isles" as you'd like. A leisurely drive from Fort William to Mallaig takes about 90 minutes. It's an out and back, unless you are taking a ferry to the islands. Or unless you are heading south from Lochailort to Salen, Strontian, and the Corran Narrows ferry for a scenic round trip back to Glencoe or Fort William.
Good luck to you. Let us know how you do.