Hello, if you still need a skript I made one that should work...

on leftclick with a netherite pickaxe:
(tab)if block is bedrock:
(tab)(tab)if {block.%player%} is true:
cancel event
if {block.%player%} is false:
set {block.%player%} to true
wait 12 seconds
break block
drop bedrock
set {block.%player%} to false

on leftclick with a diamond pickaxe:
if block is bedrock:
if {block.%player%} is true:
cancel event
if {block.%player%} is false:
set {block.%player%} to true
wait 15 seconds
break block
drop bedrock
set {block.%player%} to false​

if there are any problems feel free to mention them and if you want to change how long it take to break the block, change the wait time