Hi,
The standard phrase is 'be that as it may'. Here is a definition from google.
Be that as it may is an expression which means that, while you are prepared to accept that there is some truth in what the other person has just said, it's not going to change your opinions in any significant manner.
Here are a few examples for you.
Some people argue that Churchill was an egotist. Be that as it may, he was a great British stateman.
My friends have told me that Tom will not be a good husband. Be that as it may, I love him and I'm going to marry him.
Best wishes, Clive