I don't thik so........
Installing blanks is good practice...even when not covered by SOPs. The question however (as I understand it) refers to ingestion rather than accumulation.
1: Yes, the PT6 in its various forms can ingest planty of water
2: In icing conditions however, accretion can result in a shockingly short time....... resulting in a deafening silence - no matter how many engines you have!
Humble suggestion to keep your enquiry hypothetical rather that determination by trial and error!
Good luck and happy flying...... if in doubt operate the vanes and accept the slight drop in torque! bm