I recently (a month or two ago) purchased the angle guide for the Viel. It helps keep the angle steady, though you still really have to freehand it. If you try to keep the blade on the guide, the belt kinda grabs the blade and pulls it up, which is okay but you end up with an uneven convex edge rather than a clean bevel. You have to just use the guide as a guide for your eye, and keep the blade off of it while trying to match the angle. It definitely helps with the Viel.
120/220 to 320 to 1800 (9 micron). That'll work. I do recommend getting a surgisharp leather belt, and using some honing compound on it for a final stage. I've been using Tormek paste (8000 grit), but have recently started making my own paste, which works a bit better. Currently I only have 8000 grit on hand, but I have some more abrasive coming in the mail this week, and I'll be making 1000 grit and 4500 grit honing pastes to add to my setup. Let me know if you get the surgisharp belt, I might be able to send you some 4500 grit paste, which would be a great follow up to the 9 micron belt.
Incidentally, the reason I'm making these pastes for myself is to improve my paper wheel sharpeners. I haven't been satisfied with the way my setup handles recurves (the stones are too wide to really get into the small recurve such as on a Kershaw Blur) so I've rounded the profile of my paper wheels to handle recurves, and I'll be coating them with 220, 1000, 4000, and 8000 grit pastes to handle recurve blades.