I think one of the best cranksets has been hiding in plain sight for the longest time
It's not advertised but the XCadey road crankset can be ordered sans power meter. 24mm Titanium spindle (so no BB86 w/ 29mm or 30mm issues), 4 arm spider (unsure if the 5 arm can be ordered this way) and likely doesn't suffer from flex issues like the Magene.
The only other Ti spindle crankset I can think of are the eeWings which are 30mm. I wonder if a 24mm Ti spindle will have the same issues as one made from alloy? There's also the
Miranda X-MOD which does use a 24mm Ti spindle but there's no information on how it holds up.