Let him keep 1K LTC (@$4/each) or whatever the price is upon execution (adjust the number of LTC to equal $4k). Then he can send you 1k LTC only and keep the rest. His choice to sell them or not to equal $4k in USD. Depends if he's bullish or bearish on the current skyrocketing of the price. Either way, it's fair if he'd accept terms as such.
Thanks for the suggestion, this is pretty much the agreement we've come to.
I'll update this thread when the transaction is complete.
It's pretty nerve wracking when the price is so volatile!