I used to LUG one of these bulky thrones around just more gear to carry around all the time until I wised up and just used what ever they had at the gig, I carry a nice memory foam pillow works great just in case,..... less is more.
The cushion looks like a good idea. I found cheaper cushions on Amazon and eBay. I don't take my heavy throne to gigs either, but if I need to, I take this light stool. I got it for $8.95 just a few years ago, but now $13 at Walmart http://www.walmart.com/c/brand/trademark-global-folding-tables-chairs
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"You Shall Know the Truth, and the Truth will set you free." John 8:32