You should be using a self-custody wallet, not another KYC exchange.
So, the path should be KYC exchange - > Self-custody wallet (single use, or at least dedicated to grey market) - > Vendor.
The reason to do this is to give your KYC exchange legal plausible deniability, and make it more difficult for the feds to credibly accuse you of anything.
When you pay your vendor from your KYC exchange account, they have a permanent immutable record of you doing something that is not fully legal. In the future when political winds change and feds give them a list of accounts that paid a pep vendor, you're done. Remember, the blockchain is forever.
When you go via an in-between self-custody account, if anyone says anything you can just say you sent the crypto to a friend and you're not responsible for how they spent it. Feds now have to prove that you own the self-custody account, and if you don't blab, they can't.
Also, you can easily completely break the link between you and the peps. You buy KYC coins, you swap them to Monero (aka XMR, fully privacy encrypted coin), then swap it for the coin that the vendor wants.
Anyone who looks at this later simply sees your coins going into the void that is XMR, and on the other side, anyone who looks at the vendor's wallet just sees them coming from a void that is XMR. That's what I do, and what everyone should be doing, but since it's already a struggle to get people to stop sending coins from KYC accounts to vendors, one issue at a time.