Project Management or Accounting and why???

Accounting is a fairly big industry and offers roles at many different levels.
You can use this type of experience to work in other types of roles such as operations management.
Accounting apprenticeships are getting more popular and are a very good way to acquire skills, get an income and an education.
Be prepared to work hard to acquire your qualifications.
If you wait until graduate level to try to get a role the competition gets even harder.

I’m thinking of project management as my backup to accounting which is my main

This is a wise decision.