My school is cancelling my wp as I am not renewing my contract with them, consequently making my extension of stay invalid. How to leave Thailand by overnight bus, leave through Thai border post near Mukdahan, apply for an SETV at 8am in Savannakhet, sleep one night and return the next day with the tourist Visa?

My concerns are as follows:

1. Can I get through the border with a letter from the school indicating termination? Labour requires the school to provide a letter indicating work permit cancellation, will this also suffice? Will the form, filled in and signed by the school, for cancellation of work permit suffice? AND how should the suitable document be dated? (timing is a real challenge here)

2. If the school dates the termination or cancellation as the 30th, will they allow me through at Mukdahan on the morning of the 29th, thereby cancelling my extension of stay?

3. Lastly, if all this pans out, can I apply for an SETV on the morning of the 29th, pick it up on the afternoon of the 30th and cross back into Thailand immediately thereafter?

(Even though my work permit is technically still active??)

Would having the school cancel my WP ANYTIME on the 29th solve any hiccups regarding timing? Can we somehow forward date this whole situation?

Exhausted, clarity will be heartfelt.