it will be very tough to get any type of film cap in there. would go with the nichicon bypolar green audio grade lytics. they are already bypassed by a .01uf film of some type, so the Sony engrs were thinking about this.
if you are going to go to all that effort, I would also look into replacing the cartridge load resistors with Vishay S014s as well as R101, R 102, R111, and R115
if you are going to go to all that effort, I would also look into replacing the cartridge load resistors with Vishay S014s as well as R101, R 102, R111, and R115