Are there easier Copy-Paste optiond available on iPhone?

Re: "Are there easier Copy-Paste options available on iPhone?"

Apple support have an article online (link below) that may be helpful to you:

See: How to: Select, cut, copy, and paste text on iPhone - Apple Support

Eg says:

Tip: "To move text without cutting or copying:

touch and hold selected text until it lifts up,

then drag the text to another location."

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Re: "Is there a way to add a dedicated copy and paste button to the iPhone keyboard?"

Am no expert in this area, so I don't know for sure, just that "shortcuts" can be created for many things:

(There may be the steps of "select" "copy" and "paste" to consider).

See how to: Use Shortcuts to automate tasks on iPhone - Apple Support

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Re: "Are there any iOS settings, tools, or third-party apps available that can provide a simpler solution

for copying and pasting?"

Sorry I don't know of any, apart from the possible option of shortcuts above. (Does not mean there aren't any.)

If needed: You may want to contact the experts : Apple's Accessibility Support Team:

How to contact Apple for accessibility support - Apple Support

or

Apple's Accessibility Support Website (info / support / contact options etc.)

(NB: You can "Get Support" (online chat / phone / email etc.) from the link at the bottom of their website:)

Accessibility Support - Official Apple Support

All the best :-)