Guys, guys.
First of all a big thanks for all the suggestions.
And it is also nice how much loved the Axe is that so many recommend not selling. I am not 100% sure myself, because yes - it sounds that good, that is true.
But frankly - I work nine to five my daytime job, I write books and coach young people in my free time, I have a wife and two kids, a house that needs maintenance - I haven't played my guitar for WEEKS, if not even months. My Axe is not used, it is collecting dust. I am not gigging, have not played for an audience for many years now, I am not even practicing regularly anymore since years.
I simply had this one CD project, an EP with four songs I wrote, that was very personal and important to me, I wanted to get the best possible recording solution for it, and that was clearly the Axe Fx for me. Heck, my playing is so bad after all those years without practice, that I don't even play the guitar parts myself for the record - my timing sucks to much, I don't play tight enough or have empty strings buzzing etc. Not many people would notice it live probably, but for a record? Naaah. So I just played some sloppy guide tracks and now a few friends of mine who are professional musicians play all the instruments, including the guitars, and I will only do the vocals myself. So the Axe is currently in somebody else's studio where a very talented, extremely good guitar player friend of mine records the guitar tracks for me. When the whole thing is mixed and mastered, I will STILL not have time to practice, not play any gigs, etc.
I also don't have financial or lifestyle issues, I simply have stuff to fix on the house - new things show up frequently on an old house - and have to make the decision if I use up the cash reserves or sell something I don't use. I also will need some money for the mixing and mastering of the CD, and if I don't use the Axe afterwards anymore, why not sell it and reinvest the money into a nice mastering from Sterling? ;-)))
So, for me selling that thing is extremely undramatic. And still I am not sure, because yes, I will lose some money on it, and yes, life (and especially mine, lol) is extremely unpredictable and I have no clue if in two years time I will write again and record again and want the Axe back. No idea! So I don't know yet if I decide to sell it - I will probably just wait and see what happens in the next few months after the CD is finished. Then it either finds new use with new songs or will really become absolutely redundant.
So I am just collecting possible options here for the IF. And thanks again for those options you mentioned. I have not heard about that Amplifire thing yet, it looks tempting, but the price tag is actually a bit above what I have in mind. A used Pod HD (the bean shaped ones) can be found on eBay nowadays for around 200-250€... and I have to look at the Tonelab and the Mustang definitely, thanks for mentioning them!