how nice some country's finally allow online apply steps. here in belgium you need to go twice, for apply and pickup, that leaves you 2 days of hasstle.
That would also be my advice, buy a ticket to a country where you can get a visa on arrival, (cambodia or malaysia), stay there as long as you want , and come inside by land, for starting your METV.
Also: ask your consulate for a start date after your planned holliday to malaysia/cambodia, this way you can use your METV longer.
"having a lot of stamps" is of no issue; it's the duration and the time in betweens that is an issue !
i have my passport now 6 years already (next year will expire); and i go to thailand every year 2 times. (3 weeks in summer, 2 weeks in winter)
however in the summer i also go to a neighbouring country almost every time in this 3 weeks, that means i have every year 3 IN stamps and 3 out stamps. this means i have 18 in and out stamps in 6 years.
i never had any problem, because i only stay 3 weeks and 2 weeks every year in south east asia.
If you stay more then 6 months every year on tourist visa's, that's much more highly to be denied i guess
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