tbh audio might be the hardest fit here - low-channel sound cards on low-end devices is pretty common, last I looked, and it tends to be CPU-heavy (and these tend to use very weak CPUs). you'd probably be fine rendering it out and checking the result (slow but afaik not usually memory heavy), but it may struggle with scrubbing around.

hard to say without actually trying it tho. and depends on the device, of course - mine was like $250 when new, it's a very different beast than a $1,000+ chromebook. the higher-end ones are much closer to normal laptops.