For you, there is so much now on offer - Tesco do loads of ice cream, their own brand as well as Swedish Glace. Chocolate - beware true dairy free ones as full of sugar. Dark chocolate - 70% - that doesn't have dairy ingreds should be fine for you (cocoa butter = not butter, but do check for butter oil in some), but may set off the LO if super sensitive.
Avoid soya for baby until older or agreed by allergist as frequent cross reactivity and it's not considered good for small children (under 5s I think).
Can't remember weaning but can't remember it being hard at all. Having a milk to mash stuff with was probably hardest - we were given prescription formula for that and can use oat milk - far better than even soya in tea/coffee according to DH who uses either DS's milk (oat) or mine (soya) when he's run out. The coconut milk - in the UHT sort of milk section, not for thai cooking (try Koko) - is good for things like custard as the oat milk is horrid heated. It's also better frozen if making ice pops - have no recollection of what a 6mth old eats! :D
I can't think what you would give to a baby that was dairy early on other than maybe cheese. Violife is ok as a dairy free cheese but there's no protein in it, so no real point giving it to a baby.
Do get read up on stuff before your appt tho as some are still a bit rubbish so it's good to have a good list of questions. Maybe check out Allergy UK website? For some it's a milk allergy (the protein) for others it is the sugar (lactose) that's the prob and I think then it's intolerance.
Remember not to panic too much. So many people in the world don't and have never had cow's milk (it gets weirder to think about it the more you don't have it in your life!) that your baby will be fine and will be able to eat normally. Try not to think too much of replacements as many 'free from' are packed with fat and sugar and no real goodness.
I do eat the Alpro dark chocolate desserts, but they are soya, so not for baby. DS and I also love fruit crumbles in this season. Chuck a load of mixed fresh berries in a dish, make some crumble topping with Pure spread, chuck in the oven - best treat ever! :D
This is a jumbled reply - apologies! Feel free to pm. It's daunting to start with, but sounds like it may become a way of life soon and you'll soon get used to it.