The Ballad of Adler Young, Canto 2.5

Given the time lapse, you could always send him off to somewhere inside Faerie. You should have enough glamour, wiles, and what-not to convince him to go outside this scrying tower, and then the time change should get rid of him permanently enough.

Before he shows up get the charm on. Try to make the building more impressive looking through grammarie. Make some branches into fine furniture, say, and add decorative elements to things. Make this tower like a minature palace, to make things look impressive.

I'd recommend asking him to teach you to make shoes. And then take a break while the process is going on, and lead the guy deeper into Faerie. You may have limitations where you can go, and how you can take him, but you shouldn't have issues stranding this guy. You can magically hide the path you were just travelling on, for instance.

Alternatively, you could just do something unseelie and turn the guy into a newt or something. You do have someone else who might be willing to help you, and you can communicate with her.