There shouldn't be that many names involved.

And working for the car maker group Bentley Motors belongs to, I have to admit that those cars are not the greenest ones we offer.
But to your points:
Is a replaced board + CPU actually environmentally relevant waste? I only know cases, where someone else or the owner himself uses it further for less demanding tasks.
Actually replacing hardware with new hardware, which could deliver more performance/watt should also have some positive effect.
But finally not buying anything new and further using old hw would avoid producing any waste while being less efficient - the machine would have to run much longer for a specific task compared to a new one.
So the best would be to avoid technology at all - including Bentleys.