I thought that spot looked familiar. Nelson. Coolest little city in Canada. I thought you were a Kiwi for a brief second doing that video in New Zealand or something
Anyways, you do bring some valid points, especially on the frequently choppy Kootenay lake that gets pretty breezy at times. It's been damn windy this year and paddling into a headwind is part of the deal on this lake. I started a thread about expedition SUP paddling on standupzone.com and it was suggested that a two piece kayak paddle would be good to have on long trips if your primary paddle breaks or you encounter stiff headwinds, and I couldn't agree more. There are companies like Imagine Surf manufacturing plastic expedition style SUPs that have clip on seats, and Imagine, along with other companies are making hybrid SUP paddles that also turn into Kayak paddles now. I have also seen paddle attachments that go on the handle end of a SUP paddle. So, you aren't totally loony tunes after all.
For expedition paddling, a two piece Kayak paddle would be very smart to bring along, because after standing for several hours, it is nice to change position, and you can actually still get some miles in if you encounter a head wind. The foam block looks like it works and could easily be strapped down when you are standing. I prefer the standing position but in the future as I get into longer expedition paddling, I will be sitting down sometimes in headwinds and just to change positions and will probably invest in a kayak or hybrid paddle of sorts.
Keep up the innovation. Whatever works. Btw, I frequently paddle the south end/eastern side of the lake and will look for you and your SUP inventions when i'm in Nelson. Went paddling there in May and it was nicer then than it is now.