Not trying to be rude here, but what happens when the work is no longer interesting? You abandon it? Much of the work I find needs to be done - even on "cool" projects - is decidedly uninteresting (refactor XYZ, etc).
While the offer is genuine, and I'm sure you'll get some offers, I just can't help thinking that a few weeks down the line the honeymoon will wear off. Nothing wrong with that, but everyone needs to prepare for that.
Fine, but I was speaking to the offer from the OP. What if the OP doesn't find writing tests interesting? Someone else trying to pick it up later won't be so gung-ho to take up refactoring a pile of mess.
I'm not suggesting that the OP does write messy code, but that it could be if he doesn't think clean code is interesting.
I get the motivation behind the offer, I'm just not sure I'd take him up on it, even if I had a project. I do know people who have interesting projects and need help, and I'm not passing this on. I will be the one having to deal with the project when the OP doesn't find the work interesting any more, and I've no idea what shape it'll be in. I'd prefer to refer them to someone who will take on a project and see it past the interesting parts, commit to something longer term, and be prepared to deal with the uninteresting bits.
While the offer is genuine, and I'm sure you'll get some offers, I just can't help thinking that a few weeks down the line the honeymoon will wear off. Nothing wrong with that, but everyone needs to prepare for that.