In reply to Wulfrunian:
As you're based in Aviemore I'd suggest doing walks around there, depends how much you enjoy driving I guess. With a lot of walks on the west coast, you'll not only have the commute but will possibly be ascending ascending mountains much higher than in Snowdonia from near sea level in many cases, which makes things considerably tougher. With Suilven, you've not only got a massive drive, but a 4 mile walk in before you get to the mountain. For the targets you've set yourself, I'd suggest more mobile accommodation and take a tour up the west coast, heading east only in search of better weather, should you get shut down in the west.