Do you have a flat bench?
If so, you can do HFBR on that.
It’s at the end of this video:
You can go in the Video Library and search Hamstrings and At Home.
There are a lot of exercises in there to do with bands and body weight.
All are better than nothing if you don’t have access to proper equipment.
Other substitutions for GHRs (while not the same) are:
Keystone Deadlift
Koklyaev Deadlift
RDL
Band Pullthrough
Good Mornings (Bar or Banded)
Again, not the same, but they work the same area.