After discussing it a lot for the Vampire campaign I was running, it was decided that the symbol matters to the wielder, not to the vampire, so as long as you believe in your symbol, it works... This doesn't cover sunlight, running water, and garlic like your scheme, though. (Garlic, we decided, didn't work, unless you were part of some mad Savoury Cooking Sect...)
Then The Mummy came out, with Benny cycling through holy symbols, and we could never talk straight about it again...
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After discussing it a lot for the Vampire campaign I was running, it was decided that the symbol matters to the wielder, not to the vampire, so as long as you believe in your symbol, it works... This doesn't cover sunlight, running water, and garlic like your scheme, though. (Garlic, we decided, didn't work, unless you were part of some mad Savoury Cooking Sect...)
Then The Mummy came out, with Benny cycling through holy symbols, and we could never talk straight about it again...