You overestimate the AC on hypixel. Anything below 15cps and you're fine.
Any reach below 3.8 will bypass permanently.
Velocity above 80 bypass permanently.
By the way I know I didn't respond to your message earlier but it is indeed possible to cheat with regedit. People are selling on MC market legit private clients with 3.1 misplace and 98% velocity. These clients are meant to bypass lunar AC on
No, alt shops will not steal your main unless you give them your password. You won't get into legal trouble for buying alts, but may get ip banned from hypixel if you use too many alts.