There are a few Bitcoin traders in Cambodia that will happily change your Bitcoin into cash, no KYC- for a hefty percentage ( one is advertising on this site) But if you're laundering then it's likely worth it. That must be their business model, anyway.
The trouble is, how to you buy the Bitcoin in your own country without KYC? If you're in Vietnam, you just need to use a Bitcoin ATM. No KYC required. But, I think the Bitcoin ATMs in the US have a had to come under KYC now. I was reading 7/11 have Bitcoin ATMs now, but with KYC. Some investigation needed perhaps.
If you're not laundering then you would just join one of the companies like WIREX (in the UK and EU) and get yourself their VISA card, similar options available in the US. Bitcoin to fiat at any VISA ATM machine. You can load up on Bitcoin with their phone app via your bank account or any major debit card. Same as any other digital fiat wallets like WING.
I have also heard of a personal remittance service that enables Bitcoin transactions from USA/ to Cambodia or the other way round at minimal fees. I met someone once who had transferred $1000 for a $5 fee. Sorry, don't know the contact details. It was around 2 or 3 years ago, but probably still exists.
Saying all that, I've carried up to $20,000 in Dollars, Euros, Sterling and TCs over many borders and never had an issue