How can my partner switch to a longer visa type in Thailand upon arriving with a 30-day exemption?

Hello good afternoon guys, it’s me again and need some more help for my partner.

Background: I am in BKK on WP and my LGBT partner (we cannot get married) and I want us to live together here in BKK.

Question: do you have recommendation on a visa agency that can help to switch visa types so he can stay longer? Can this process be triggered when he flies in on a 30-day visa exemption?

Thanks in advance for your help. My partner is flying in on Monday so need some help ASAP so we can get his application started when he gets here

My partner’s passport country is the Philippines, same as mine.