I can understand and sympathize with your frustration. You just want a reliable vehicle for your daughter and you are right to be concerned about a 14+ year old truck. I'm kinda in the same boat with my daughter, her '94 Corolla is doing OK but I know it's only a matter of time till I get the call that it's got something major wrong and I'll have to do something about it. The hard part for me is she's 2 hours away so I can't easily go rescue her like I had to back in September. Not sure what to do about it.
I'm a little concerned with your diagnosis, as I'm not aware of any coolant passing thru the intake manifold gasket. It's been several years since I've torn one of those engines down, so I may be wrong, but I just can't think of any reason for coolant to be going up into the intake manifold. Do you have a Factory Service Manual that you can take a look at to confirm this is really where the leak is? There are several other hoses at the back of the engine inside the V, right in front of the firewall, I have seen these leak but their location makes it hard to see without at least taking to top plenum off the intake.
If it is the headgaskets, and you really don't wanna mess with it (understandable), then I think at the least you could find someone that would buy the whole truck for at least more than a junkyard will give you for it. At least try to find someone that can trade their worn out tires to send it to truck heaven. Post an ad in the "Parts Trucks" section here (don't forget your location and some pictures), see if someone wants it.
If you lived near me and it wasn't so darned cold outside, I'd help you fix it.
Good luck.