I am not sure how Inter Milan are going to stop Manchester City from claiming the Uefa Champions League trophy today as Manchester City totally demolished both Bayern Munich and Real Madrid on their way to the finals, I think the manager of Inter Milan might approach this game with a defensive strategy and try to hit Manchester City on the counter attack but I guess it would still not be possible to stop high flying Manchester City winning the Uefa Champions League trophy at the final whistle today.
As you said, the only ideal choice for Inzaghi is to play defense. with the scenario, there are 5 players in Inter's defensive area. 3 players low block, two front attackers prepare to counterattack. even then, the Inter players must be adept at intercepting. if the scenario worked out, it meant they had room to counterattack. the question is, can the Inter players do it, we will find out soon.
Conversely, if the scenario is like this, City will automatically have more control over ball possession by controlling the course of the game. the danger is, when the City players start to dominate the midfield, some players will look for space to make rapid progress and it is in this situation that the Inter players will be tested for their discipline. because, when City has done circulation, rotation, with 4 players, namely Grealish, Gondohan, De Brunye and Bernaldo Silva, plus Haaland, they will try to open up space for each other to make fast progress. Inter's situation is in jeopardy. in fact, sometimes City's two pivots can stab forward into the Inter penalty area. if a goal is scored quickly, Inter will automatically play openly to equalize. and, then we can imagine what will happen.
But again I have to say, what I said was predictive which has always been City's style of play with its 3-2-4-1. in fact, we will not know what will happen in the field later. as a friend said in a gambling discussion, @Daniel91, he said, the longer the game is in a draw, the greater their chances of winning. and what he said, could have happened. but still, I have an estimate that City will score a lot of goals against Inter in this final match.