Yup, lactose is possible, as is artificial sweetener. My recommendation would, however, involve manning up and drinking dry ciders =p.
JKs - I like a good sweet cider too (the older style Bulmers - what the hell have they done to it lately?). If you don't like the acidity you can do a Malic Acid conversion to lower it:
http://www.homebrewtalk.com/f32/maloatic-f...ntation-137206/
The bacteria is available at wine brewing shops, just get a small size and add it on day 3 of fermentation. I haven't used it myself yet (I'm acquiring a taste for dry cider), but have heard good reviews.
The apple juice mixes taste sweeter when fermented:
Apple / Pear - You can usually get apple / pear 50% juice from the supermarket (same price as straight apple). The cider I made with this and some apple (so about 1/4 pear in total) ended up very nice.
Apple / Passionfruit - not recommended - urgh - it's orange and hazy because of the added pectin and tastes just like fruity lexia.
Apple / Berry (of some description) Yum!
Apple and Blackcurrent was spectacular. It was spritzy, and not as acidic, and even when completely fermented out held onto just enough sweetness to make it a great summer white / rose wine replacement (commercial cider drinkers love it too).. I haven't tasted any of the other berries yet - probably will as soon as I can source some cheap. Probably not the strawberry though - it's got pectin added too (probably to keep the strawberry in suspension) so will be hazy again.
I haven't tasted mango and apple yet because I think it'd probably be similar to the passionfruit one.