I'm certain you'll have to get a taxi, my friend. The SWG3 is a terrific venue but really bad for getting to and from.
I'm glad The Arches is alright. It's not my favourite venue by a long shot but it has so much outside of it's club nights that you would have feared for other clubs in Glasgow if the Arches had went. I guess it's paying the price to some extent by hosting more mainstream events that bring in crowds who aren't as clued up on what they're taking compared to Subby, the Art School etc. the Arches does do far more than most though to look after it's clubbers with the wellness area and sensible drugs information plastered everywhere.