What options do I have for helping my American husband with his visa situation in Thailand?

He can go to savannakhet to apply for the 1 year multi entry non-o based on marriage. It costs 5000 baht (+entry into Laos), and there is no financial requirements. With that visa he can enter Thailand as many times as he wants during 1 year, and each entry gives him 90 days of stay. That means he can stay around 15 months in Thailand with that visa, without visiting immigration ever. It's not really what you asked, but it's an option that not everyone knows about

Your Husband is an American Citizen. He can apply for the Treaty of Amity. ONLY US citizens can get this in Thailand. A good Accountant or Lawyer can process this for you. You own 100% of the company. (no Thai partners needed) You'll get a work visa and only have to do a border run every 90 days. (OR if you've left the country during that time, your start day reverts to the day you re-entered) Google it.

The administration of this FB group is;

'Thai Visa Centre'

⭐⭐⭐⭐⭐ reviews and an awesome service.

a border run and a subsequent visa-exempt entry, or a visa-run to Vientiane and the application for a 60-days Tourist Visa does not make any sense at this point. This is because of the recent "overstay", he CANNOT use the "change of visa type" from a TR visa or a visa-exempt, to a 90-days Non-Imm-O marriage visa anymore. Your ONLY chance is either the "Multi Entry 365-days Non-Imm-O family visa" (or the "90 days single entry Non-Imm-O marriage visa") from Savannakhet, OR he flies back to the U.S.A. and applies for the Non-Imm-O marriage visa over there. The Savannakhet option is absolutely doable, a few hundred of expats do this every year and the officials at this consulate are super friendly.

Pong Nam Ron is the Myanmar border, which is closed for foreigners by now. I would emphatize that your husband flies or drives to Mukdahan, and from there to Savannakhet, Laos (as Vientiane asks for appointment and for the financial proof!) You should accompany him (although your presence is not actually needed, yet is better for the overall picture and you will have to sign documents when there). You need your fresh Thai marriage certificate, your blue housebook and Thai ID-card, and a few other documents (that are listed on the Thai Consulate Savannakhet website under the "single entry 90 days Non-imm-O "family" visa") The consulate offers a walk-in service. Your husband can apply for the "365-days multi entry Non-Imm-O family visa" based on being married to a Thai wife. The fee is 5000.- Baht. Savannakhet is the ONLY one of two consulates in the region (the other one being the Thai consulate Ho Chi Minh City) , where your husband can receive the "1-year Non-O marriage Visa" WITHOUT any financial proof! Upon each entry within the one-year visa validity period, into Thailand, your husband will get stamped in for 90 days stay permit. The 1-year visa will give you plenty of time to amass 400,000.- THB on a Thai bank account in his sole name. He will need this financial proof to be able apply for the "1-year extension of stay permit based on marriage to a Thai wife" (which some of you call "marriage visa" yet actually is not a visa but a stay permit)

Do you mean a run to go and obtain an actual visa at a Thai embassy in another country or do you mean just to bounce out to obtain another visa exempt entry?

A visa agent normally helps you get a visa in Thailand, not a visa outside of Thailand. You can look for a visa run agency that takes you to the Thai consulate in Laos. I believe Thai Visa Service does this from Bangkok at Lotus On Nut.

There aren't any visa runs to Cambodia because the Thai consulate in Cambodia isn't near the border.