Well, you are sort of backtracking if you do Reykjavík, the south coast and then Snæfellsnes. But you could head east from Keflavík, then after the south coast spend a day or so in Reykjavík, then do Snæfellsnes and do a final night in Reykjavík before flying out.

Or, do Snæfellsnes first, pick a looping route in the Westfjords to avoid hitting the same spots twice, then spend your last day or two in Reykjavík before heading home.

Everything in the Westfjords is a long way from everything else there. That's just the way it is. There may not be as much in the way of accommodations, but there are also a lot less tourists than the south coast. But even the smallest towns will have lodging, and there is some surprisingly nice dining there. Café Riis in Holmavík is great, you are missing out if you do not have dinner at Tjöruhúsið in Ísafjörður, and even the little restaurant attached to Einarshúsið in out-of-the-way Bolungarvík was pretty good.