In the past Quad had exemplary after sales service. I suspect that they will be able to supply a replacement remote and will repair the electrostatics -- at a price.
Given that the electrostatics are among the best sounding speakers ever built it might be a good investment.
Not so sure about the CD player -- most of mine have come from car boot sales sound good -- all based on the old Philips swing-arm laser mechanism.
The fact that the Quad uses Philips parts does not mean it will work with remotes from other Philips based players.