I've been thinking about this on and off all day long............I can't imagine why you would plate hone with a flex hone????? I consider myself pretty imaginative but it don't make sense. Rigid stone hone absolutely no argument there......but a FLEXHONE???? The operative word there is flex.....a 3/8inch dia or there about's glob of abrasive on a flexible stalk, it's point of contact is minimal, given radius of the glob and the cylinder wall. You are not honing for stock removal, if you are honing for stock removal then you need to then use a different hone.
I hone 30 seconds a cylinder, when I use my flexhone.
In my opinion don't worry about finding a plate if you are using a flexhone, it's a waste of time and energy.