All Codemasters games published by Camerica use a board functionally identical to UNROM plus software-controlled lockout defeat circuitry. Did you mean "PRG ROM should be good"?
I'm not sure of the pinout of Camerica PRG ROMs, as most of the research for wiki.nesdev.com appears to have involved Nintendo boards and third-party Famicom boards, not unlicensed NES boards. But if it's the same as JEDEC standard EPROM, as I suspect, and the PRG ROM is good, then it should work when soldered into a ReproPak board from retrousb.com (along with two mapper chips and a CHR RAM).
Codemasters games don't make sound until they've decompressed the "Codemasters: Absolutely Brilliant!" production logo. Then there's a downward slide followed by a "ding" and some buzzing.
I noticed that when I launch Camerica games--such as Micro Machines or Fire Hawk--in my emulator, I hear what you describe above during the animated logo: a ding followed by buzzing. The buzzing is generated by the Square 2 channel. Is that really supposed to be there? I do not hear it in other emulators. Instead, I hear a nice clear ding, without the buzzing.