Krabi Immigration Update:
Just closed the loop on my under consideration stamp dated April 14th. I figured I'd better try today since Songkran is next week.
It took 10-15 minutes. I just explained what I was doing there to one of the helpers and she ran off with my passport for 10 min and came back with shiny new stamp.
Stamped until May 29th.
TLDR : Answer Summary
A recent update from a user indicates that they successfully obtained a new stamp at Krabi Immigration, extending their visa until May 29th. The process took about 10-15 minutes and was completed before the Songkran festival, after the user explained their situation to a helper who facilitated the process.