Greenland paddles don't have to be short, you just paddle with a slower cadence with a longer paddle. I have 87” and 96” GPs and use the latter exclusively for my 27“ wide Incept kayak. For my narrower kayaks my current favourite is my Tom Yost design 91” x 3" modified Aleut paddle. Instructions here
http://www.yostwerks.com/GPIntro.html.
With its flat power face it's very powerful and efficient for its length and was very easy indeed to make as you don't need to shape the power face at all, so making it takes only half as much time time as a GP

. Get a
competent lumberyard to make the basic shape on a bandsaw and you can finish it with just a chisel, a good block plane and sandpaper in very little time. Start at 96” and you can easily make it shorter later.
Don't worry if it's not perfect; mine has transverse ridges near the tips where the lumberyard bandsaw operator did a bad job, grooves on the back due to my impatience/not sharpening the plane enough/going against the grain on occasions AND is slightly warped so the 2 power faces aren't parallel to each other. None of which seems to make any difference to the performance!
