The CR-C multiplier will be expensive and unreliable with Caps that can handle loads of ripple current.
The peak current will be inverse to the allowed ripple, such as 10x at 10% ripple even if just at 10% duty factor. The Cap ripple current may be rated at 110'C with the rated RMS current * ESR thus require very large Caps($)
The other factor is the EMI and THD & poor PF you are injecting into the line.
First define all requirements; budget; time ; surge; output load regulation, ripple, THD , inrush, input regulation 3kV or 6kV insulation?
Load response? Source impedance? Load impedance? MTBF?
It may end up being a make or buy decision.
It may be you have an EDM solution in mind, which demands much more in current and voltage sensing for regulation.
Always research specs and make one before starting any design.
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