Carwiz.....just did a quick search for you online and came up with a load of websites that seem to imply titanium is routinely plated by an electroless nickel process....see
http://www.titaniumfinishing.com/page06.htm for example. I didn't do enough research to make sure that this is definitive but at first glance it looks like electroless nickel does plate Titanium. So, in this regard, electroless nickel and electrolytic nickel may be very different.....though it'd be nice to confirm this definitively by someone here who has experience with Titanium in electrolytic and electroless nickel baths