I have a short 4 hour layover in BKK en route to VTE.

I plan to travel overland back into Thailand in 5 days after i land in VTE. I'd rather just pick up my Thai visa while killing time at BKK airport, instead of picking it up somewhere in Laos.

Would there be any issue with picking up a Thai visa in BKK airport and then immediately leaving for VTE (not exiting BKK airport)? Any multilple entry/exit issue, or cost issue? I'd rather not have to cross security again in BKK airport...so is the place you get the thai visa airside, so i won't have to cross security once again?

I have been to BKK before but i can't remember the process/options. Thank you.