Because I'm not nearly done beating the dead horse that is the Cancellation Class, here's Perun's video on it and the USN's inability to build a clean sheet surface combatant in general over the last 30 years.
https://youtube.com/watch?v=r7aWmtOhMjoI was surprised he didn't bring up either of Australia's new frigate classes when talking about possibility of adopting ready-made allied designs. Especially since both classes involve homework copying themselves
Hobart Class- Aussie built Spanish F100
- 6150 ton displacement as delivered/6900 ton max load
- Aegis equipped
- 48 cell VLS
- 5"/64 main gun
- 8x Naval Strike Missiles
- 1x R2D2 CIWS
- 2x 25mm RWS
New FFM-Mostly Aussie built upgraded Japanese Mogami
- 4800 ton displacement as delivered/6200 ton max load
- Aegis equipped
- 32 cell VLS
- 5"/64 main gun
- 8x Naval Strike Missiles
- 11 cell SeaRAM CIWS
Considering Marinette Marines' current order book is 2 Cancellation Class and 3 LCS, I don't think Fincantieri would be too upset building someone else's ship design.