G'day from WA.
Yep, I'm an Aussie, if keeping things "in house" is of interest to you.
I can certainly do this for you, but I need to see one of your original videos first please, so I know exactly what I'm working with.
Can you send me one, then I'll quote properly (ignore bid $ at this stage, it's purely nominal).
And then I'll also send you a brief sample of what you'll be getting from me. In particular, "fixing" badly recorded audio is always a compromise between removing unwanted sounds and affecting speech quality. There's no such thing as magic, you can't make a silk purse out of a sow's ear, etc, etc!
Reply if you'd like to talk more.
Cheers
Sid