Basically not. For regular universities, thesis is the last link to obtain a degree certificate. Is it necessary for an accountant to get a bachelor of arts degree by writing literary papers? However, it seems that there is no explicit stipulation that you can't write interdisciplinary papers. You can communicate with your tutor first. If the tutor says no, don't use graduation thesis to develop your hobbies. You can write literature at any time as long as you like.