...of whether your school allows it or not, never forget....
IF IT IS A STUDENT SOLO - THEY AREN'T ALONE, THEY'RE FLYING WITH YOUR LICENCE ON BOARD AND WITH YOUR AUTHORITY/SIGNATURE.
If your not comfortable with it, don't authorise the flight. Simples....
IMHO - not comfortable with the idea (in general).
...because there are no instructors around who are current in spins
As part of the UK FI course, an instructor has to demonstrate spin recovery - and every second renewal/revalidation will be via a flight test, therefore - you're only ever a maximum of 6 years away from your last spin. If you're an aeros instructor......