Need to overstay but want to avoid stamped passport

[DrJack54]

11 minutes ago, black tabby12345 said:

Convenient border is just up to where you are now.

The OP stated that he is located in Bangkok.

Best option is to apply for extension that will be rejected and stamp (posted earlier in thread)  will show 7 days limit to exit Thailand.

No negative impact from that stamp unlike an overstay stamp. 

Anyone needing more that the 7 days "get out of dodge" stamp can do border bounce. 

Visa run companies do that from Bangkok