Change Concrete5 Users tabel to InnoDB

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I have a project running on Concrete 5.6.
We are building a mobile app which is going to use Symfony2.

For the FOsOauthServerbundle I want to create a custom usermanager to work with the users table of Concrete5. (We already build a web application with Concrete5 which holds all the data that is also needed in the app)

The problem is that I need to map the entities of the bundle with the Users table.
Because the Users table of Concrete5 is now MyIsam, this is not possible.

Can I just change the Users table to InnoDB or will this cause any problems?
Besides that it will make some changes to the table (primary key etc), will it affect any functionality in the application maybe?

Or are there any other things I need to think of?