You got right into it. One weakness of Hungarian.
I can't think of any good way... I think people should avoid such titles
But in theory, you should handle titles as new words using the default rules, and add the suffix accordingly.
For example there was a newspaper called Tükör (Mirror), but you have to say Tükört in accusative, instead of the normal "tükröt", which is used normally, when not in the title.
Similarly even if names are words that are somehow "exceptional" in normal usage, you use it as if it was not exceptional, the default rules apply.
E. g. president of Hungary is called Sólyom László, Sólyom being the surname, it means Hawk.
Normally if you want to put hawk, sólyom into accusative you say sólymot, but in case of the name, you say Sólyomot, as the name is treated as something "new".
But I still don't like this "Vissza a jövőbe" + -ben thing. No good solution there, weak point of the language.