Vortex Sound Research

I’m thinking about getting an extra keyboard that’s more portable than my beloved 75 pound Kawai digital piano that I use at home. I need something light with some weighted keys suitable for piano, but i would love to find something that can do some synthesizer duty. My dream would be an 80s/90s FM synth or rompler that could also serve as a basic digital piano like a Yamaha P-45. I’ve been looking at old Kurzweil K2000 series synths but i’m guessing those weigh a ton.

Are there any products new/vintage that could fit the bill? Would like to find something under 1000 USD.