Understood - I absolutely recommend trying out the free version before buying a license.
Here’s the patch: https://build.sailfishos.org/package/show/sailfishos:chum/x10iii-cam-button
and here’s a forum topic about it:
https://forum.sailfishos.org/t/toggle-xperia-10iii-cameras/15975
I’m obviously biased as I’m a Jolla employee. But I am using Xperia 10 III as a daily driver. It’s possible to use all three cameras; there’s a patch which allows you to choose between the three cameras and the selfie camera. You don’t have to use the loudspeaker; the echo issue happens very rarely - the last time it happened to me was in June 2022, i.e. over a year ago.
If you already have the device, why don’t you try it out yourself?
The trademarks owned by the Linux Foundation are listed here: https://www.linuxfoundation.org/legal/trademarks Neither “systemd” or “segmentation fault” are listed. Something smells funky here.