I appreciate your sincere concern for the trainee students.
Ps. be informed I have briefed both the students to un doubtedly go for Rembrandt hotel and speak to you.
As you have mentioned WP is valid for 30 days from the departure date. And their departure date is scheduled to be 27th,Feb. and to report to their duty from 1st March. So, now you can safely proceed for getting their WP as hardly there are 23 days in their departure.
Ps. Rest assured they are joining you and personally I have strongly recommended them to join you.
You are requested to go ahead with the visa formalities and any inconvenience caused is regretted.