Since I'm one of the few people I know who might agree with you about prefering manuals, I'll share a couple of thoughts even though I can't answer your questions. My reasons for liking manuals: Long term reliability, and the thought of escaping through the window if I ever go in the drink. Your reasons may be different, but if you are unable to make the conversion, perhaps one or more of the following will make you feel better:
1) My manual Suburban windows screwed up and required an $100+ repair for parts + labor. True, electric would have been even more expensive, but manuals are not 100% bulletproof, and I do like being able to lower the far window while driving...
2) If you can't get manuals, consider adding a sliding glass rear window as another potential way out in emergencies...
3) If you can't get manuals, consider buying one of those special hammers that the EMT's carry (designed especially for, you guessed it, breaking windows), and place it in a door holster. Then you CAN get out if you have to...
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2001 ETH shipped 5/27, QC, LWB, 4WD, 3. 54, Pyro & Boost gauges