I haven't watched Macross in 20+ years, man.
All I know is the current Tenchi situation does not support "adding" either one to the other without erasing the effect of one of them. You seem to know Macross better, with a healthy respect for the other, but play to your strengths.
Jurai + Galaxy Federation does not want Earth artificially accelerated with alien tech. So, even if it did crash, The Tenchi crew are still well within their abilities to deal with it. Last episode, Tenchi himself whisked away a "Borg Cube" with a swish of his sword. Even if they couldn't stop it, they could transfer it to the subspace of one of the multiple tree ships around.