Another alternative is to get a HG8110H from eBay which would allow me to conceal and protect the ONT and fibre cable. But I have no idea what the difference is between the HG8010H and HG8110H. I've looked up the specifications online and both appear to be identical.
Your installation (actually your address) is locked to the serial number of the ONT provided.
You cannot change it without some shady tinkering.
I'd leave it as if there are no issues.
I've seen pictures of hundreds of installs, and descriptions of thousands of installs.
Not seen a single enclosure used except a couple random new builds. Even most of those don't use enclosures.
You're not missing much.