Without knowing the values and what sort of wave shape you are trying to obtain, a half bridge would be of some advantage, you would have a high side switch in series with R1, which would be your charge cycle, you then turn off the high side switch, have a deadband where both switches are off, then turn on the low side switch and this is your discharge cycle. This way you are only discharging the capacitor you are not also having to pull down your HV supply.