The Lenovo ThinkStation P330 can be upgraded to Thunderbolt 3 using their riser card (p/n 4XH0Y77510).
The card requires DisplayPort in and a 5-pin connector. These cards originally retailed for around $200-$300, they can be had on eBay as of this writing for $100 from China.
I purchased a ThinkStation P330 and noticed the connections for the card,