Question about Gallic Civ ships.

[Nocturnia]

So, Gallic Civilian ships, something like the Roc line, just French.

My question is. Is it possible to use these ships Sirius wide?

I mean, the line of RP is quite simple:
Buy a GaCiv ship (Eclipse in my case)
Contact your friendly spaceship workshop (Junkers)
Make them replace the core and engines.
Profit.

But is it technically possible? I mean putting Sirian engines nerfs your core to 10%