If the Kemper uses DSP chips, which I believe it does, it won't be a question of just running a wrapper around VST code written for a general purpose CPU. Software written for a DSP (or a graphics processor, dedicated FPGA etc) is designed to use the capabilities of those chips, you can't naively translate from code written to run on a general purpose CPU core. Getting the best out of a DSP architecture isn't trivial.
A closer example to what you're asking for is the UAD hardware, which runs as an external co-processor with dedicated DSP and can host plugins, but those plugins have to be designed for the hardware, you can't just run a regular VST on them. Same would apply for the Kemper, it could be designed to host plugins of some kind (internally that's probably exactly what's happening) but they would have to be Kemper-specific plugins. It'd be cool if that was possible, but it would be such a support nightmare for Kemper I really don't imagine it'll ever happen.