This has been a problem with Seasoned Advice for quite some time, and despite it being reported for 6 years remains unresolved and unaddressed.
We get a lot of questions that really belong on another SE Site. However, the "Close: Belongs on another site" option only lets us choose Meta. According to the other question, the SE interface only allows us to designate up to 5 other SE boards, so we can't cover all the probable ones.
As such, the obvious solution is to make this option "Close:Belongs on another site" with no site option specified or required. Since this is a "community-specific reason" it should be in the powers of our Moderators to address. No?