I would recommend Roland BK9 and a Bose L1 Compact and a lightweight stand. 76 keys, light weight. You will love the organs and piano.
Cable out to the Bose is all you'll need. Plug 'em both in and play.
There is one button that instantly transforms the kb into all piano, or all organ.
You can carry everything easily in one trip. Perfect for both very low volume and for those times when you need a big sound.
I'm old and I know some stuff.