Unlike mainstream 9W flights, I believe one can upgrade to Konnect on voucher, irrespective of booking class (except for G - group bookings), and whether or not you're JP Plat (on mainstream, only Plats have the benefit of upgrading on any fare class, for all others, its got to be K or higher).

Need to confirm if this is correct. If yes, its a decent way to travel in a little bit more comfort !