I haven't tested but this is a PHP solution(you will need to add the .php extension to your page name) going by your last example paste this code in the head section(placeholder > html(head)) of your page.
PHP Code:
<php?
if(isset($_GET['page']) {
$page = $_GET['page'];
if($page == '123') {
$page = 'MyPageXYZ';
}
if($page == '223') {
$page = 'Page' . $page;
}
if($page == '339') {
$page = 'NewInfo' . $page;
}
header('Location: {$page}.htm');
}
?>
Create a rectangle where you want the input to show and go to placeholder > html(body) and paste the following
HTML Code:
<form method="get">
<input type='text' name='page'>
</form>
If PHP doesn't suit there is likely a JS option but I don't know it off hand, I'd have to look it up.
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