Can I leave Thailand for Laos or Singapore with a full passport to renew my multi-entry Non-O visa?

Hi guys,

I would love some advice if possible. if it is not allowed, please delete the post.

I've got a multi entry non O visa based on marriage.

My issue comes from my passport and that i am out of clean pages. i DO have plenty of open spaces in my passport as IO stamped their entries on which ever page my passport opened on.

I have already applied for a new passport from South-Africa more than 5 moths ago and word on the street is it won't be delivered in time here in Thailand before my entry date has expired, which is the 19th of February.

So, i would like to know, if i can still make a trip to either border of Laos, and they will allow their visa in my passport even though their are no open pages? or would i have to go to a country which SA don't need a visa, ex. Singapore or Phillipines?

Also if i go to these countries, will i run into trouble due to a lack of open pages on my way back to Thailand?

Thanks in advance