All legalities aside I'd look for the seller to create their own access prior to the sale or walk away, as painful as that may be I think otherwise you're potentially opening yourself up to a world of pain. As mentioned the seller is just being unreasonable and unrealistic, the upsetting the tenant thing is red herring, if they installed their own path I can't see why the existing tenant wouldn't see that as a positive rather than something to worry about.
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