Two things:
1. If you don't love the bike now, you won't love it later.

2. Bike seats for kiddos scare me. Can you buy a used trailer instead? Use the bike you love to pull the trailer, ride the bike you love by yourself when you are on your own. (it works)

(so I'm advocating returning the bike you didn't really want in the first place, buying the bike you fell in love with, and getting a trailer for the kiddo.)

BTW: handlebar height really is adjustable. I ride my road bike with the handlebars higher than the saddle. And she ain't no comfort bike. It might take a new stem or whatever, but it's all good!