Another option, slightly shorter, maybe better is via the Subang Airport road and Glenmarie. This route is just over 3km and the Subang Airport road can also be very congested due to it being a bottle neck serving the Kg Subang, Ara Damansara and access to the NKVE.
With 2 LRT stations and a KTM station, will this make Kencana Square attractive? Perhaps, .... but bear in mind that even from the existing Kelana Jaya Station, it takes over 30mins to reach KL Sentral i.e. 10 stations!