First of all, Tottenham needs to get to the final. Even though the victory over Bodo looks crushing, it's only a 2-goal advantage, I fully admit that Bodo will be able to win them back at home and take the game to extra time. The situation for United looks much simpler as the game will be at home + Athletic are 3 goals behind, so I don’t expect any surprises here.
If the final is United vs Tottenham, then United will be the favourites as Tottenham are serial losers.
Tottenham should have a smooth win or at least a draw in Norway. Tottenham might not be doing well in the EPL, but we cannot compare the English Premier with the Norwegian League. The English side should just get a goal to move the goal deficit to three and play defensively all the way. The Norwegian soccer team represents a town of 55,000, and I am sure fans from other parts of the country will come to support them. We might likely have two English team finals. And if that happens it would be a game to watch since both sides need to win to get to the UCL.
This seems far from guaranteed to me. At the moment, the Tottenham Double Chance outcome is quoted at 1.40 and I think you will agree that bookmakers will not give you a free 40% profit on one bet. The chances of Bodo winning are quite real. A simple Bodo victory is estimated at 2.96 - quite a common occurrence when such an outcome happens. Of course, winning by 2 goals is a completely different case, but also quite real.
On the one hand I would like Bodo to win, but on the other hand in that case we will have too unbalanced final, and it will be difficult to hope for a second miracle in a row (Bodo's victory).