I make homemade ice cream. I have made lacrosse free ice cream for people several times. You need to find lactose free whipping cream and lactose free table cream but once you do you're golden.
500 ml 35% whipping cream
1 L 10% table cream
1 1/2 c granulated sugar
1 tablespoon vanilla extract
(Sorry I'm Canadian, that's how we measure things.)
Dissolve the sugar in the table cream. (It's hard to dissolve that much sugar in whipping cream.) Once the sugar is dissolved add the whipping cream and vanilla and stir to mix.
That's your base.
Put it in your ice cream machine and make it into ice cream. Put it in a container and freeze it hard.
If you like milkshakes throw a bunch of the ice cream you made into a blender, add lactose free milk until it mixes nicely, then add an once of your favourite bourbon. (Or don't. I fucking love bourbon milkshakes)