Well, I have to either attach it to my phone with a clip of some kind (which makes for sometimes questionable ergonomics or for a very wobbly, insecure setup that makes me fear I'll drop my phone) Or I have to put my phone down on something, which for the sort of thing I use devices like this for just isn't doable.

Personally I never felt the use of a clip or some other mounting system was that bad or wobbly, i certainly don't feel it's so bad that I had to spend money on a device with limited functionality (or a downgrade) just to manage that problem. Seems like backwards thinking or a bad solution to a problem that doesn't really exist.

Which is exactly the point I'm making. I want to split that battery life up between devices, so my phone is less likely to die on me. I can deal without a handheld game console but if my phone taps out it's more of a problem.

Which leads to my point. Why did you spend so much money on a device with such functionality if you are worried about using it? For the cost of one of these handhelds you can buy multiple battery packs/portable chargers and actually use the expensive phone you carry around with you at all times.

Honestly if your phone dies that fast check your battery as it could be dying.