Can i redirect non-SNI capable web browsers to an alternative site?

YES, it's possible to redirect non-SNI capable browsers (Internet Explorer auf Windows XP). - Stack Overflow has an article on this topic:

Code taken from this article:

var redirect='http://REPLACE_WITH_NON_SNI_URL';
var sni_https_timeout, sni_http_timeout;
var https_req = $.ajax({ url : '', dataType : "jsonp",
}).done(function() { window.clearTimeout(sni_https_timeout); var request = $.ajax({ url: "index.php?ua=sni_check_done", type: "POST" });
sni_https_timeout = window.setTimeout(function() { var http_req = $.ajax({ url : 'http://SNI_TEST_DOMAIN/sni_healthcheck.php', dataType : "jsonp" }).done(function() { window.clearTimeout(sni_http_timeout); window.setTimeout(function() { window.location = redirect; }, 200); }); sni_http_timeout = window.setTimeout(function() { sni_http_fail(); }, 8000);
}, 8000);
function sni_http_fail() { var request = $.ajax({ url: "index.php?ua=sni_check_done", type: "POST" });

snitest.php / sni_healthcheck.php:

if (array_key_exists('callback', $_GET))
{ header( 'Content-type: application/javascript' ); echo "{$_GET['callback']}();\n";

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