No, PageEdit will not support Plugins as that would mean having to copy a huge body of code that enables plugins as well as adding a complete Python 3 interpreter.
That said, if proselint highlights a point in CodeView as most validator plugins do, why not launch PageEdit on that one xhtml file using the pencil icon and use the Find built into PageEdit to navigate to where you want to fix. Do all your long prose fixes in PageEdit and Save and Exit back to Sigil and rinse and repeat.
Alternatively you could add a bunch of FIXME strings in Sigil first and then search for and fix each in PageView all at once.
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