I have the Weeride deluxe and my son loves it. He’s now 2 but started at about 14 months. He’s never fallen asleep in it but he’s also never slept in a buggy, car seat or anywhere not a quiet, dark room!
Your knees are very slightly splayed when riding so long rides (an hour plus) do feel a little harder than otherwise but that could also be the weight of a child on your bike. Gentle off-roading is better with the child’s weight centered.
My son hated his hat the first time but now loves being on the bike so much, he’ll often go and get “Patrick’s hat, daddy’s hat” and stand near the front gate saying “bike thank yoooooo, yes please bike”
As above, I can’t imagine clearance being a problem. However, even though my bike’s got a 1 1/8″ steerer, because it’s carbon, I didn’t want to damage the bike. The front clamp only has a small area so I added a 5mm spacer under the stem and clamp the front around that.
One thing that worried my wife was that the child is hidden from motorist coming from behind who might have given you a wider birth. I bought a cheap hi-viz vest and wrote ‘child on board’ in nice big lettering.