Everything scales. Pretend 1.0KVAC. Instead of 0.5Amp current, draw 0.05Amp. Result will be 1.414KV which you multiply by 10 to get actual voltage. R and C and %ripple values will be unchanged.
Or wrestle with the Spice, PSPICE, LTSPICE or TINA of your choice.
(I won't say 'sliderule'.)
Paul Reid