I want to help, send me your sketch and instructions.
Excellent! I'm on my way to bed so I'll send (PM) you the Sketch and instructions when I get up.
I like the idea and I hope to do some more testing on it.
But I can imagine a potential problem. Typically, a seed is generated when power is first applied (in setup). At that point, the processor is presumably still warming. This could create a pattern in the readings.
And I know of a problem. The ATtiny85 processor always returns even values when reading the internal temperature sensor. Well, I can't say they all do but mine do. According to the datasheet, that is actually within the specifications.