I approached a supervisor about a PhD application. At this university, you must have two supervisors, so after a meeting, he invited the other "supervisor" to discuss the topic. Honestly, this new supervisor doesn't suit my topic. In fact, he proposed some topic changes that I am not happy to do. However, for the rush of the moment and the nervous, I said yes. After, I checked the credentials of the new supervisor. He just graduated last year and I would be his first PhD student. I received the offer letter and this last supervisor was appointed as the main supervisor. I received a scholarship from my government (not from the university), so no funding is attached to the supervisors or topic. I haven't "officially" started the PhD.
I will have a meeting soon and I was wondering how I could ask to change the main supervisor? I will argue that I want to focus on my original topic, but what to do if they say that I can change the topic, but with the same team? Is it wrong that I would like to have a more "experienced" supervisor as the primary supervisor?