When to use academic titles in presentations in Europe?
If I understood correctly, you live in a culture where flaunting one's title(s) comes across as a bit crass; at the same time, you wonder if mentioning your title on the first page of a powerpoint presentation might increase your credibility when you are presenting to certain audiences.  (Did I get that right?)

You may be able to get the idea across in a more subtle way, that people would not interpret as bragging, on the first or second slide, as an acknowledgment.  For example, you could acknowledge the mentorship of Prof. XX in the YY Master's program at ZZ University.

That's just an example.  Does it give you some ideas?