Sorry, but the very fact that you are entertaining this expensive change in platters made me think you were entering into it with the bias that acrylic would be superior to alu. Anyway, you asked for opinions, and you got opinions. I would sooner experiment with platter mats, if for no other reason than the cost factor.
One bit of caution: you probably want to be sure that any new platter is not too far different in mass and circumference from the original, for three reasons: (1) the motor was probably chosen and tuned to move the mass of the OEM platter, (2) if the tt is belt-drive or rim drive, then the motor pulley circumference was chosen to give the correct speed when coupled with the OEM platter circumference, and (3) an excessively heavy new platter might cause premature bearing wear.
One bit of caution: you probably want to be sure that any new platter is not too far different in mass and circumference from the original, for three reasons: (1) the motor was probably chosen and tuned to move the mass of the OEM platter, (2) if the tt is belt-drive or rim drive, then the motor pulley circumference was chosen to give the correct speed when coupled with the OEM platter circumference, and (3) an excessively heavy new platter might cause premature bearing wear.