You put aside the fact that Bayern don't want Ronaldo at Bayern.
And with this it will actually become clear that they can't bring in Kane as you say there are still many options and it's not just Ronaldo. Bayern still adhere to their philosophy and Ronaldo is not included in theirs.
Bayern still have to find a striker but definitely not Ronaldo.
Bayern Munich always wants young and talented strikers, which means Bayern Munich would prefer to get a young striker who has become a star and is famous in the football scene. Even though it is very easy to conclude that a striker like Lewandowski who is still very productive in scoring goals is also willing to be released by Bayern Munich, so I also don't think that Bayern Munich would want to look at Ronaldo to be placed in his team at this time.
Ronaldo can be a solution for Munich for the front lines. but it all depends on the interest and seriousness of Munich.
if consider the purchase to be a Munich business and long-term investment. Of course, Ronaldo will not be on the Munich buy list. with old age, although the arrival of Ronaldo will make sales of jerseys and souvenirs from the club increase. but it will only last for the duration of the contract. I think Munich is thinking of a player asset that has more value in the long term.