What's not being said here is to Slow Down! Most people seem to bat along at 100kts whatever the conditions.
A spamcan will turn on a much tighter radius at 70Kts than 100Kts, one of the first things they teach you on a mountain flying course. Obviously you will have more time to sort things out and believe it or not the duration and probably the range will actually increase.
In my one experience (so far) of this situation the diversionary airport which we had passed overhead only moments previously proved difficult to re-locate for landing because of the deteriorating weather and the handling pilot staying at cruise speed.