Caught this a bit late but honestly, I have to disagree about the adapter being too much of a hassle. Sticking purely to native glass on a tight budget usually leads to disappointment because the RF line is just overpriced. I had issues with the build quality of the cheaper RF primes and they just dont feel as solid as the older EF stuff. Heres what I would actually look at:

• Canon Mount Adapter EF-EOS R used. If you find one cheap, you can pair it with old glass and its much better than the basic RF kit.
• Canon RF 50mm f/1.8 STM. Default choice, but like you feared, that 80mm effective focal length is a nightmare for indoor shoots.
• Canon RF 28mm f/2.8 STM. Better for tight spaces, though the background blur isnt as good as expected for portraits. Unfortunately, you're picking between a focal length thats too long or a lens thats not fast enough. Dont sleep on the adapter... its the only way to get decent results under $250.

> Im on a super tight budget, like under $250. Unfortunately, youre in a difficult position with that budget because the RF lens catalog remains quite expensive for new users. The Canon RF 50mm f/1.8 STM is your only viable option under $250, though I was personally disappointed with its performance on the R10. While sharpness is adequate, the lack of image stabilization is a significant disadvantage since the R10 lacks a stabilized sensor. Your assessment of the crop factor is accurate. At an 80mm equivalent focal length, youll certainly struggle with tight indoor compositions. I also experienced issues with autofocus reliability in low-light scenarios. While the Canon RF 35mm f/1.8 Macro IS STM provides a more versatile focal length, its twice your budget. Stick with the 50mm for now and try to shoot outdoors where you have room to step back... its still way better than the kit lens.