Hmm well I wouldn't call it a flyaway, more like an unfortunate series of events where it tried to RTH and had bad settings with which it was told to follow.
Anyhow... if you enjoyed flying it, I'd totally suggest getting another but just the drone itself.
Definitely would not wait for the platinum, it's barely any different and since you already have the controller you'd be out even more $ for no reason. Not sure who voted for that but it's the least sensible of the options by far.
I would definitely do a fly over while recording in 4K the path and area the mavic was on when lost with your new mavic.
Then study the footage at home on big screen to see if you can locate your lost bird.
You dont have to be postioned were you lost connection
I didnt say to replicate your loss.
You are allowed to move or change position to control the drone.
I voted #3
I flew thru that narrow ridgeline "saddle" in the upper left corner of the picture. Plus, I was 800' below on the other side.