You could install roll bars, yes. You could also stretch the fabric over them. You'd also have to use parts of the frame from the top, because it's what the windows seat against when they're up. Other than those pieces, and the locking rail from where it locks to the windshield, you could pretty much frame it up with whatever you want, especially if you never plan on dropping the top.
Safer is relative. I won't answer that question.
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