I also arrive on April 1st. I requested my thai pass last week and got the approval 5 days later. I suggest you hurry up and request it as soon as you book your hotel and insurance.
So I came to Bangkok to do the washout for HK as well, while I was here they changed their QT rules so I decided to stay here instead. Yes its a good option but come prepared for the possibility of staying here a bit longer in case they change their rules. I basically gave up on HK for a while and I am enjoying the freedom here inThailand.