That currently sounds like a good idea.
Both my brats have thier own pcs but usually they are on the home network but with out internet acess.
They don't know what a search engine is and are only allowed visit sites which we have vetted and placed in thier book marks.
Another option is to cache the sites they vist so they can browse off line.

These solutions won't last for ever and at the end of the day it is the parent's responsibilty.
Schools should at least give the options of evening classes to make parents aware of the issues.

Thier primary school from 3rd class on does use some intersites for reference work but there is a comprehensive consent form to be signed before a child is allowed acess.