Send multiple activation links to all users of a certain usergroup, at once

[adpar]

hello,
is there a way

to
send an activation link to all users of a certain usergroup, ?

(will send it via php, or via Vbulletin CP but how can I generate it? )

(I am opening a new forum, attached to my existing one,

and will import all users to an invisible users awaiting confirmation group,

and in order for them to participate,

I want them to activate their acounts themselves,
and then appear in the visible registered usergroup

and want to send all of them an email that will have an activation link of their personal account just like the automatic message the system is sending when you register.

Please can anyone help me with it,
I am willing to pay a fee for it, since it is relatively urgent.