I graduated with a bachelor's in Management Information Systems (MIS) from Sam Houston State University (SHSU) the December of 2004.
The reason why I graduated with a MIS degree and not one in accounting is because I was failing accounting classes and switched my major to MIS to graduate on time.
If the school you choose is like SHSU, then the business program will have a core of classes that every business major has to complete that includes subjects such as accounting and marketing.
Since I had most of the business core knocked out, it was easy for me to switch majors and graduate on time.
The reason why I bring up why I switched majors is to illustrate the point that there is usually a lot of overlap and a double major in two business majors would still be a lot of work, but less work than say, accounting and computer science.
Marketing is more about helping businesses understand the market/consumer preferences and to sell their products and any other offerings.
Combining both expertise can help but in my view it is better to focus on these one by one as the CPA required full attention and also covers business areas that can help you quickly learn marketing related matters.
When I was a product manager (marketing), I relied heavily on my cost accounting expertise to manage the product P&L (profit and loss statements). Yes, I could have just taken the analyst's word at face value. Instead, I fought to ensure that only those costs that applied directly to my business was and argued convincingly to keep costs low. It wasn't just to be more profitable, it was to ensure that every product line took on its fair share of its costs. As you grow your career, a basic knowledge of different areas of business can be highly beneficial to you to make informed decisions.
Does this require a double major? Not necessarily. But it does require some aptitude and coursework.
Good luck to you, Saksham.