You can get an older version (2.7) of get-pip.py
curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
In my opinion, you should create a python2 virtualenv and install your python2 package in it, as well as pip2. For example, when I installed cuckoo sandbox, I did it like this:
virtualenv --python=python2 cuckoo/ # make your virtualenv folder with python2
cd cuckoo
source bin/activate
curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py # get pip for python2
python2 get-pip.py # install pip in your virtualenv
pip install cuckoo # install your python2 package
Hope it will help.