Property with girlfriend of 7 years

Hi all, not a throwaway because I don't really mind if she finds this. Im wondering if it is possible to apply for joint home loan for our home, we've been thinking of wanting a property but the thing is due to circumstance, we're not registered yet.

I did read another post that has a similar title to this post, and most people recommend NOT to get the home under joint name as long as you are not yet married. We're planning to marry soon, at the very least register, but the issue is that we booked a property we really liked, and we don't think we can get registered in a month which is the booking period, what's the advice for this case?