FWIW I don't find the syringe confidence-inspiring because when the filter is actually clogged, the backflush pressure needed tends to pop the friction-fit filter off the syringe. So you're left to try holding the two together while pressing the plunger while trying not to get soaked.

I kind of like your solution here. (FWIW the faucet backwash hose supplied with the other Sawyers works perfectly at home, and a field backwash using the clean water bag and connector hose at least keeps a solid connection. It can leak at the screw cap.)

Cheers,
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--Rick