Can you get HHR and then leave Taiwan in the year before conscription?

[newhere]

@comfy123

Could you therefore, get Taiwan HHR and then leave Taiwan in the first year and return after service age?

See if “overseas compatriot endorsement” applies to you, I guess

@newhere

Points 3 onwards of this thread explains this Overseas Compatriot endorsement in some detail. But your son is not a NWOHR, his HHR is only in a moved out/inactive state:
https://www.reddit.com/r/taiwan/comments/o0j206/getting_household_registration_a_guide_for/