Yep, high pirate contract can give you 14th ships (Through it'll rarely sale in black-market, except you sale the 14th ship or sales 14th ship blueprint)
Albeit by Lore.
14th battlegroup is the founder of the Hegemony but the related-tech to build's a truly functional 14th's ship was lost.
*Because most of the ship used Domain era tech which many were lost and many are label as forbidden/heretic tech by the Hegemony and the Luddism.
So the current 14th ships in Vanilla are what's left of the 14th expedition who arrived to the sector.
They can no longer build and many still scatter across the sector. (with likely more than centuries old)
** I think most of the low-tech/midline ships in Hegemony arsenal are based on 14th designs. (better speed but worse armor)
***If put Iron Shell mod in the game.
The entire 14th battlegroup arrives to the sector (In Vanilla only the few 14th member arrive to sector while most of the battlegroup were lost in the faraway place outside the Persean sector) with has all 14th's related-tech.
This allows the Hegemony to re-access to their lost 14th again.