This all sounds great!
First a question:
How do the adventurers back at your Stronghold go on their own adventures? Do we just get an story from them and the items they acquired, or do we take full control of them and run their adventure?
Finally, a suggestion:
The way you describe it, it sounds like you are teleporting back/forth (game mechanic, not a spell) to your Stronghold a lot unless this is working in some other way. Would it be possible for random events/updates from the Stronghold coming you to via a messenger rather than just a pop-up message? Perhaps this messenger would depend on your class.
For instance, A magic user might receive the message via an imp appearing in a puff of smoke with the message, a ranger via a raven or owl etc, a paladin via a squire (Thinking Monty Python's Holy Grail now...). It might also be a fun point to inject some character and humour in these one-off but functional NPCs.