I'm not a programmer so completely understandable if this would be a pain in the ass. I've always wondered how difficult it would be to add a disclaimer screen to the intro of any fan translated game saying that if you've paid for this translation then you've been hosed.
It would be a huge technical PITA to do it in a way that would make it difficult to remove ... but it's possible.
The thing is, it would be not only ugly, but also rather pointless, since Tobias has already figured out how to neuter that strategy.
He just has to sell customers reproductions of the original Japanese games, and then optionally allow them to add a "free" copy of the English translation to their purchase, as an act of pure generosity on his part.
The end-result is the same ... he's basically charged people for English translation, but it's been done in a round about way that purchasers would feel good about ... probably even a lot of people here.
It would also
technically get around any licensing restrictions for the dub ... or there would at-least be a good argument to make that it does, that would require expensive legal battles to litigate.
He knows this, and he already did it with Dracula X.