Are the risks of aluminum wiring reduced with higher-efficiency fixtures?
Focus on what is known to work.
AFCI breakers
What are you concerned about?  Fires.  Why? Because temperature changes, plastic deformation, dissimilar metals corrosion, and oxidation are causing contact surface/pressure to be lost.  How would that start a fire? Arcing.
AFCI breakers are uniquely good at catching that. They are usually easy to install.
If you have a main panel like a Pushmatic that does not support them, then install a subpanel and route your wiring to it.  Possibly one on each side of the main panel so you don't have to extend wires very much.
And when an AFCI breaker trips, treat it seriously.
Metal boxes
Of course a contact can just overheat.  But that is vanishingly unlikely to be a problem in a metal box, becuase the heat has to reach the metal box before it can reach the wood, and metal has such very good thermal conductivity that it will make the entire box warm, rather than a small part of the box hot enough to ignite anything.  And of course if the box is grounded, the arcing will cause an AFCI trip.
I would also recommend metal box covers, same reason, if they're grounded.
But in the aluminum wiring age, metal boxes were pretty common.  I would change out any plastic ones.
Between AFCI and metal boxes, I wouldn't even rush to do the Alumiconns and all that.