Digital BW, The Print

I know Platinum Rag was designed for MK ink.  But I just read an
article by Royce Bair in which he states:

"Using PremierArt's Print Shield in combination the Matte Black ink
over top of all of the papers (except the Ink Press Fiber Gloss, which
benefited little by this application) produces some incredibly rich
blacks, especially on the Crane Museo Silver Rag."

From this it seems it's possible and perhaps even desirable to use MK
with Silver Rag?  That's the first time I've ever heard of this, so I
just want to be sure I'm not misunderstanding.

Reason I ask is I love the F-type papers (have tried Harman Gloss,
Silver Rag, Platinum Rag and Innova F-type so far) but hate switching
back and forth from MK to PK on my R2400.