+1 for Vientiane
Don't worry about paperwork. The form is just one page. You can get the form, the copies of your passport and the pictures taken in the building on the left side. Go to the consular section (here:
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26,102.
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45,16z/data=!4m8!1m2!2m1!1sthai+embassy+consular+service+vientia+ne!3m4!1s0x0:0x229bd78d156a373f!8m2!3d17.
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57!4d102.
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24). Passport drop off starts at 8.30am and pick up starts at 1.30pm the next day.