Congratulations on optimizing your Exec Club experience. Sounds like BKK is a good place to build up tier points affordably. As frandrake said, for that many flights, your total cost seems pretty low.

any work associates you can gift the extra status cards to? or friends in the expat community in Thailand who also need to travel home? On the other hand, even if your relatives only travel rarely, having lounge access in Helsinki would be very nice. just thinking out loud.