Ok. I see what you want to do. A daily driver with mild off-road use.
The problem with the slip shaft is that the u-joint at the transfer case end is really small. Smaller than a 1210 u-joint. But, for mostly street use it should be fine.
Since you don't plan on any hardcore wheeling and tons of suspension articulation I don't think the driveshaft will fall out. Deciplerocks used the same t-case and front driveshaft and never had a problem. And he wheeled it hard.
What size tires do you plan to run?
Did you get the front driveshaft with the transfer case? If you didn't, I have one sittingin my garage collecting dust.