What is a "mega hairy hermit"? ID the species before moving any further forward with that idea. Hermitariums make great, easy to keep nano tanks that are much simpler than even a FOWLR, but it is critical that you know what species you're buying. A hermitarium is definitely the easiest out of the set of things you have listed. If you put the tank by a work desk or something too, many species will become very friendly and interactive with you. Not all will, but very active, fast species usually will.
However, if the species is Dardanus megistos, which goes by a ton of different common names with the word "hairy" involved, then I would not recommend them for a 10gal. I say this even though I just moved mine to one...so forgive my blatant hypocrisy lol. But seriously, in my case it was out of desperation for a place to put the hermits. I tried desperately to find room to fit a 20-long but couldn't at the time and the hermits had to move immediately, so they are currently stuffed in a 10gal. The sub-optimality of the situation it has been obvious to me so far, hence why I cannot recommend them in a tank that small.