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Let me just address your first (2) paragraphs.
"I'm speaking about removing the rear driveshaft and mounting the e-motor inline with it. You'll be driving the rear axle with both the gas engine and the e-motor, or just one or just the other, depending which way you want to run at a given point in time".
I get all these options with my proposed plan, with the added benefit of:
1) Being able to remove the motor from the driveline altogether.
2) Have a gear reduction as an option for low speed use.
3) Not subjecting the motor to suspension abuse.
"If you were to mount it as an input to the xfer case from the front axle's output, without it driving the front axle, you'd get nowhere, unless you're in 4wd Hi or Lo, which presents it's own particular set of problems, specifically the inability to shift on the fly (back into 2wd mode), the inability to exceed 45 MPH (not recommended in 4wd Hi, either), and the specifically shorter gear ratios assigned when in any 4wd mode".
Not sure where you get your information or assumptions.
The only time "I'd get nowhere" is if xcase is in neutral. Otherwise, I have (2) motors from (2) different drives to select from, separately, or in combination as mentioned above, (with added benefits). 2Hi is another option I have that you omitted above.
No "particular set of problems" here. My truck shifts with no restriction, on the fly.
45mph in 4Hi not recommended by whom, you? I don't think many would buy a domestic full size 4x4 if the manufacturer made such limited recommendations. Perhaps 4Lo, but that would be from an rpm limit, not gears.
I'll stop here.
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