I'd say you've been given some pretty bad advice. Never knew anyone had to employ a lawyer to fill in a form. But hey! To each their own. If you have money to throw into the wind, go for it! 😆😆😆
Another option is to not get a re-entry permit so your current stay stamp will be voided when you leave. Then apply for a new OA in your home country which will give you another two year tenure without having to transfer money. You will still require the insurance
They can get ED visas if they intend studying. At university these can go for three or four years. Tourism visas probably METV is best. Can get up to nine months from the one visa