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I have RP. Here is no compact lenses in RF mount. Only 50 1.8.
Compact Canon EF lenses looks utterly ugly on it via bulky adapter.
R is just as heavy and bulky as 5D MKII.
It sounds like you want your robust and most used camera to have autofocus lenses. If not, passive adapters will give you access to dozens of small legacy lenses from Pentax, Olympus and other brands. Minolta and Contax tend to be a bit bigger, but Pentax M and A SMC, Super Takumars etc are tiny. And they will work well with your RP, unlike the rangefinder lenses designed for film.
As others have said, a reasonable option is a secondhand Sony A7r II, maybe pair this with Sony's compact lenses like the 35/f28, 28/2 and 55/1.8. Sony have also released a set of very small primes with f2.5 aperture, and Sigma have the Contemporary 24/3.5, 35/2, 45/2.8, 65/2. That's the direction I would head if I were starting from scratch and wanted a compact but robust setup.




