What are the chances of getting an academic position year after completion of PhD? My situation is as follows: 

When I will have completed my PhD, I will not be able to immediately apply for a research position at a university, as my girlfriend will want to move to a certain city and she wants me to come with her. My chances of getting a job at the university in that city are very slim (since getting a job in academia in general is very slim). I'll leave out the details here, but I cannot really opt out of this plan anymore.

Another important piece of information might be that I am in the Humanities. So it's not like I could work in my field so easily and then later get back into academia. The type of work I would be doing would be quite different.

So I will have to work out of academia (and out of my field) for a few years. I could try to set myself up as a part time independent researcher - would that help? I would really like to work in academia, but it's quite difficult given the circumstances. 

I am completing my PhD at a very strong university, if it helps.
You could consider working as a lecturer (with a lower income) to at least get the teaching experience needed, and then you could do some research through the department and some as an independent researcher.