Success!
After further disassembly (removed timing chain cover and chain ramps) I was able to spot the nut hiding under the intermediate shaft gear. I tried to recover it with a magnetic probe but could not get it into the right location (the tool John posted would have worked). I also tried with a piece of wire but just pushed it farther under the gear. Finally I put a small amount of mineral spirits in to get thin out the residual oil and hoisted engine with flywheel side up and it fell out onto the floor. Thanks for all the advice!
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