If this was me and I'd see my alt getting Trust inclusions, I'd open a thread in Reputation to request members to exclude it.
If people trust you, that doesn't work.
Marlboroza tried that 3 years ago, and he's still stuck at DT2 strength (29).
It might be different with an alt, but there are no guarantees.
I mean, asking people to exclude my alt account if I see it getting Trust inclusions.
Simple mention the issues it creates towards bitcointalk if the alt gets into DT, and ask DT people to exclude the alt in regards to that.