Use "is" if you think there really is a way, but you just don't know how to do it. "Is" is not contrary to fact. Use "were" if you think there really is NOT a way to do this, and you know it to be contrary to fact.
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Grammar GeekWe could set up "The Society For the Preservation Of the Use Of the Subjunctive In American English" [SPUSAE]. We could collect $2 annual dues. I'll volunteer to be treasurer for the
Technically, you should not use "was" -- but you're going to hear that more and more as the subjunctive slowly disappears from American English.