Depends, is the interior of your can hollow or filled with filtering material (stainless mesh etc). If its hollow, hooking it up like you said would be as good as not having one.... oil vapours in -> oil vapours out.
Yep, I've done so with a suitably sized brass bolt from pirtek. Only thing left to do is hang a filter off the free cam cover pipe or connect it to a vented container. The cam covers can't be blocked off altogether, it needs to be able to release any pressure build up.
The engine doesn't need any oil in the intake, we're not driving rotaries here. Macka, adam32 (i think), deesh and myself have diy jobbies. Ask us at the next cruise.