i've been on völkl SL boards, they're substantial and capable of enduring considerable loads. beefing-up will move any failure from excessive stress to the next weakest point. in terms of our sport and the gear we use, tib-fib comes to mind.
i'd suggest you investigate how you think you benefit from using the k-plate and vist setups. it could be that one of the custom makers can achieve a similar board response without the need for a plate, eg elliptical edge engagement from a stiffer midsection, instead of nearly radial.