There's a place in Birmingham that sells large thick gel pads that strap onto the seal like an Airhawk would. They makes seats for Triumph and will do customer seat mods too for decent prices. I've seen the pads they make and it felt pretty good, was around £45 for one. The gel pad is sewn into a cover that has fixing straps. I just can't remember who they are now, "theshed" will know, he showed me the place. I figured if I ever needed a bum that can last longer than 1.5 hours (the longest I can manage) then I would get one of those. It might be worth an look as an alternative to the Airhawk. Then again, you could always find a gel pad for sale somewhere and make your own pouch. I think the Mighty Marmot did a seat mod with pics in the Howto section, he might have mentioned where he got the gel pad from.