Perhaps gewunnen, meaning conquered, and not gewunen. I don't think you can use present subjunctive after béo anyway. Here béo is almost surely the 3rd person singular subjunctive of béon, the verb that we know as to be. If gewunnen, then we can interpret it as being the past participle, which makes a lot more sense (and fits the provided translation). The past participle of gewunian is gewunod, which clearly isn't the word used here.
Edit: translator's automatic conjugation is broken, sorry for copy-paste.
Good catch, I wasn't even thinking if there were a different, related verb that might be used there, nor of the particular grammar. That's just where that form gewunen showed up in the translator.
If the verb is winnan or gewinnan, the past participle would be gewunnen. In either case, the sense is conquering to obtain, or alternatively resisting, struggling against, enduring or suffering. And there are less ambiguous words to use if the sense was that Death would be defeated and eliminated, i.e. destroyed, or even mastered or overcome.
In other words, it still looks ambiguous enough to me that it could mean that "...three shall be their devices by which Death shall be tolerated."
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