Speedy stitcher is amazing, I use it for straps all the time. That said I wouldn't want to put more holes in the canvas- it's not just rain but condensation to consider and even with waxed thread you're still introducing stitching.
I patched my shelter-logic with HH-66 PVC Vinyl Cement Glue doing the old school rubber cement trick where you let it dry on both pieces and then apply. I think that technique, with the penthouse fabric and proper glue (tested on some spare spare penthouse fabric) would be the ideal solution- no heat.
I'm pretty sure the canvas is treated with something for water shedding/water proofing, and I'm not sure what heat will do to it. As a backup you can always use the speedy stitcher is the patch peels (which is my plan for the shelter-logic).
I'd ask SMB for patching techniques and what the "right" glue is when you're asking for your fabric swath...
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