Ok, I did some digging about for X2/Y2 caps I might have.
All of them are 250VAC rated, so I plan to place a pair in series for voltage spike buffering.
I have a couple 2200pf Y2 caps that are new, leftover from a Tek scope' PSU recap exercise. At 2-30Mhz the series pair yields 1.1nf and about: 72 to 5 Ohms reactance across the phases. At 120Hz it's 1.2Mohms to 18Mohms.
Worst case 120Hz current flow across the phases = 0.2mA. A power dissipation of .05W.
I guess I can wire them up across the phases using some #28 hookup wire with heatshrink for proper insulation which would act as fusible wires in case of an 'incident'.