Background: Friend, our two partners, and I are cruising from Venice late November. I use a 150kg power wheelchair and am comfortable with moderate bumpiness, steep slopes, and relatively narrow paths. My friend uses a walker and has Coeliac's Disease. Our partners are both able-bodied, and we've all done a fair bit of international travel. Also, I've read a number of threads here and on TripAdvisor and have looked extensively through the relevant pages on www.sagetraveling.com/ and https://europeforvisitors.com/.

Our current plan is to arrive in Milan Tuesday, visit one site in Milan on Wednesday (probably Duomo cathedral because some sites say Il Cenacolo is accessible while others say there's a 12cm step, and I can't find any detailed accessibility info about the ossuary of San Bernardino alle Ossa), catch a train to Venice on Thursday, visit Murano and Burano Friday, have nothing specific to do on Saturday but get to the ship, and then see stuff around St. Mark's after the cruise returns the following Saturday. Partner and I fly out of VCE noon-ish the next day; friends leave by train later.

My questions:

I know we aren't spending enough time in Venice, but is the above plan a reasonable one for a late-November visit? Should we do St. Mark's on the Friday before the cruise and Murano/Burano the Saturday after? Should we be doing other things entirely?

Are crowds in late November smaller enough that we should consider a hotel near St. Mark's? Hilton Molino Stucky looks very interesting, but various comments on FT and from family of other couple suggest it's likely to be too cold/windy and too far from Venice proper. We're looking at the Best Western Premier Hotel Sant'Elena if we can't snag an affordable and accessible Marriott/Starwood. Should we opt for something more central than the BW?

I read on the New Venice Vaporetto Rules thread about why wheelchair users get a discount. Does anyone here have a sense of how likely it is my friend could also get the discount, as she would find it difficult and exhausting to use bridges with stairs? If I buy extra discounted tickets and she sits on her walker (it's designed for it) on the boat, would we probably be okay? Also, are the special rules/waiting areas still in place? (Were they ever?)

Are the "temporary" ramps for the 2018 Venice Marathon likely to be in place when we're there? I've read they can be there Oct-May, but some people don't mention them at all.

Finally, does anyone know of particularly wonderful gluten-free-friendly and accessible cafes/restaurants/grocers in Milan or Venice? My friend has access to online communities that will have GF recommendations, but I figure this is a good group to ask too (I've already directed friend to the Dining in Venice and Help with Venice restaurants please! threads)

Thanks for any guidance you can provide. We'll try hard not to be obnoxious tourists, and we'll be sure to have coins and small bills for use at shops and restaurants!