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There are at least half a dozen more craters 1km & larger than shown.

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'h' is indicated plainly separated on the pre-LO LAC chart of Plato (made using photos from various large observatory telescopes and visually checked with the Lowell refractor) and Higgins' photos with his 18" also shows them plainly separated & resolved so they may not be all that difficult to resolve with a larger instrument.

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I suppose it depends on how one defines a "large" instrument . I find h to be rather difficult in my 10 inch, and usually, I see only the "big-4 +1" e and f, and occasionally g and h under excellent conditions. Once, I did manage i and j, but they were marginal at best. If the sun is high at all, only the "Big Four" tend to be visible. Of course, there are many times when even in Hyde's C14, all we would see would be the "Big Four".

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On the same note, the LAC also clearly indicates 'p' as two craters, one irregular and slightly larger on it's major axis; which is accurate as the LO photo shows the southern is indeed an irregular form with the third between them as an invisibly small crater of less than .5km--but there is no hope of seeing this crater with any telescope, even as an additive, unresolved feature.

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The Lunar Orbiter image of Plato clearly shows that p is indeed a triple, but the third member is, as you indicated, probably not visible from ground-based telescopes. It is a much shallower pit sitting adjacent to the other two, and the mentioning that p is a triple was not to indicate that three craterlets are visible in the telescope. Below is a section of the original L.O. image enlarged and enhanced a bit (with "p" enlarged) to make the numerous crater pits more easily seen. Clear skies to you.

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