Shortest bachelor available for you would be to take a Bachelor's degree in Philosophy from the University of London International Programme,
which is only 2 years long. I have no experience studying with them, but there's quite a few Bachelor degrees with that Uni that if you do not have the minimum requirements [A-levels], you can take a foundation 1 year course, and then with that certificate, they will minus 1 year from your bachelor degree allowing you to complete the degree in the same time as everyone else.
This was confirmed to me by the admissions team.