Ed, that would never work with me, it’s a bit like asking me what socks I’ll be wearing on a Tuesday in 4 weeks time!
I have three different MTR rigs, each with different band combos, I have the FT817, a gazillion RockMites etc. I can’t possibly pack them all with accompanying antennas, power cables etc. I did at one time write each rig down on a piece of paper and then I put the pieces of paper in a jar. For each SOTA activation I would draw a ‘ticket’ from the jar and then use the selected rig for my activation!
I do leave stuff on my pack ready for next time, but generally it comes out again and gets put back in during the packing process. My summit shelter, spare gloves and first aid kit tend to live in my pack. Trouble is, I have a lightweight pack (Mammut Lithium 32)and a heavyweight pack (Osprey Mutant 38) depending on the activation!
I did once have a preparation failure - I’d used hex bolts to hold my MTR-5B case together and when the rig’s uProc crashed during an activation, I had no way to reset the rig. I didn’t have amy means of removing the screws to get inside the case. Luckily I’d packed a spare rig! 
I called in at hardware shop on the way home and bought a hex key that now stays with the MTR-5B at all times!