It would be truly amusing when and if such a tactic were
possible: imagine striking a deal with the residents to hop on the
bandwagon of upgrading, allowing temporary ownership of the ward to
the ruling party and then taking it back after the work is
done.
Do you take the ruling party for morons?! 
They will just as soon merge hougang into aljunied GRC to ensure
complete and utter control. Same for Potong Pasir, expect it to be
absorbed into Bishan-Toa Payoh