@Bernardo ************
if Manila is using the Evisa online application system, the DTV Visa will be issued by email. COPY and carry the Evisa email with you to show the Thai Immigration Officers upon arrival into Thailand EACH time.
And I would Carry both passports as the DTV Visa was issued to one passport .
WHY complicate things ??? Just enter Thailand with the same passport as approved for the DTV visa?
Is it a Filipino passport issue for you?