Yes it is absolutely replaceable. You need to remember it is a encrypted security feature, so you'll need the apple ID or password to regain control again if replaced. That's the whole point to secure your data.
I know it's tough with cracked glass. You just need enough to get in a plstic pry tool or guitar pick. Then you can pry it apart. Just be patient, I cannot stress that enough; the electronics are very, very small and fragile.
It's not needed to remove any components besides disconnecting the battery and cables that connect to this screen. There are way too many unneeded steps here. Look at this guy replace the assembly: https://www.youtube.com/watch?v=EB3QGsp5...
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