I can understand. Use whatever feels best. I've used a single blade in the V10 Sport a few times and it really makes it ridiculously easy on the arms to paddle it. I lose may be 1mph in speed but still fast enough. I've also used a Greenland paddle just to see how it works and it works just fine.
Had a shoulder issue for almost a year myself and the paddling was aggravating it a bit, when my form was sloppy - much worse. As long as your condition allows you to keep your arm horizontal and in front of your chest, with good rotation actually there is very little motion in the shoulders - the upper arm barely moves relative to the shoulder joint...
Kayak Motor Kit
Pull-Up Strap Handle Kit
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