As as far as trying to convert it back, my electrical/mechanical skills are very limited, unless there is a YouTube video on it, it is not going to happen
A Youtube video? How about a bunch of folks that would enjoy helping you walk through it, if you work with them? They are here.
If you make the effort to post pictures and descriptions, and can follow directions, there are quite a few knowledgeable folks on here who would make the effort to help you put that thing back to stock military config. You'll learn a lot along the way, maybe have some fun, and wind up with a much more reliable vehicle at the end.
The only downside I can see is that it will cost you some time, which maybe you don't have (I know how that is!), and you'll no longer be able to say, "my electrical/mechanical skills are very limited". At the end of the process you'll be a certified expert on your truck.
Or maybe just certifiable.
Anyway, whatever you decide, a block heater is not the answer to a system that isn't working properly. The best you can get out of that is to push the problem down the road a bit. A kludge, non-working system will eventually bite you.