If you think of Davinci seriously, you will need more capable hardware anyway
Gt730 with its 2GB will be insufficient very soon (been there, done that). It’s not that Davinci works slow with too few nvram, but it just doesn’t work.
For photo I use Rawtherapee + GIMP.
Other than Davinci, you could try CinelerraGG, that works on lower end hardware too, and is a reliable mature software. Requires a different way of thinking though…
Installing Davinci on Linux is not quite hard as long as there’s the appropriate hardware.
Maybe I’ll cover the way I did it, as well as ny workfliow.