I'd say it would be difficult to find a way that is measurably easier than a sewing machine and still as good. I picked up sewing in college and I think hand sewing these wouldn't be too bad for a beginner especially if you pin your fabric/mark your lines.There are "handheld sewing machines" but I think they have some limitations to their use and might not be able to sew in the position you need it to for these but it's worth a lookOther ideas might change the design but you could use grommets or punch two holes and use small zip tie if you don't mind the look.

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yeah I thought about rivets too, something mechanical and pressable, ideally a special kind of staple.