Sony has a very compact lens that would be good in low light that works with both a full frame and APS-C body.
https://www.bhphotovideo.com/c/produ...m_f_2_8_g.html
Good sale on a body and lens kit that you could leave at home.
https://www.bhphotovideo.com/c/produ...s_digital.html

I've shot RAW with a Pixel 7 Pro and 6 Pro for years, still can't come close to a full-frame RAW or even the JPG out of the camera.