The 4.9 works absolutely fabulous with the kite. I've sailed mine 1-up and 2-up with the kite in all types of conditions and sea state--the design and build is absolutely solid and completely "up to the task." So you should have no worries at all adding a kite. Furthermore, the boat sails quite well with the kite!!!

A bit of trivia here--initially the 4.9 was designed with a kite in mind. From what I've heard, initial tests with the kite slowed the boat down because it was too fiddly, so the kite was nixed. That was before snuffers and flatter/narrower kites. Instead the 4.9 ended up with a rather generous jib.

Fast forward a few years to about 7-8 years ago and kites for cats (along with launching systems) made them feasible for the 4.9. Many 4.9s now have kites and I have never heard of a structural failure specifically attributable to kite use (barring skipper stupidity).

The Taipan has great upwind bows; downwind they are adequate but could have more volume. So deep reaching requires getting the weight back, whether or not you have a kite. Having sailed the boat in every possible configuration (ie uni, sloop, uni/kite, sloop/kite), I can tell you that the downwind ride is better and more forgiving--bow wise--with a modern kite.