LMK if you have found a solution!
I installed an Alpine iLX-007 in a 2DIN Gauge Pod Housing that sits on top of the central dash air vents. It's a tad beyond my finger's reach without stretching, but at least it's not half (a third) obscured by my elbow in my 2DIN's original location. I bought a steering wheel with audio controls back in December. Not sure if the wiring for SWC is already there or not, and as I don't have a torque wrench, I haven't yet swapped the steering wheel over!
I also have a cheap rear camera from AliExpress, but that involves a bit of surgery and as I live in an apartment, I can't sort of leave a half-finished car in the garage and only work on it when I felt like it. Similarly I have a powered subwoofer ready to go, but haven't got my act together just yet!
We replaced our seldom driven second car with a new Golf, which ended up being our daily driver as it's shorter, more frugal, great in the city. It even has a rear camera and I have to say, I've lost a lot of confidence parking the Forester without one! I really want to get that part of the install finished and while nice, rear parking sensors are not as necessary if the camera can be trusted.
As for yours, I suppose it's up to you if you wanted to throw more money at it. Having a CarPlay HU really helps. There are now single DIN CarPlay
units out, but as usual, it may block something useful while the screen is out.
I'm convinced if I got that rear camera going and with a bit more thumping bass, I'd drive the Forester more again.