You could fit a ca18det. I saw lots of them when i was there the last few years. You could get one shipped to you from there. Maybe you could get it shipped to poland and drive there and pick it up.
They have the same block so it will bolt in.
I know it. And CA18 have a normal price outside my country, but shipping 1 engine cost not so cheap. And biggest problem - taxes and corruption about it. When you go to pay customs fee - you don't know how much it can cost. Sometimes it can be 300% from price.
You could probably do the same for a rb25det conversion.
For RB engine I need new gearbox - CA gearbox have a longer housing.
But the biggest problem is price. CA18DET for swap (with wiring, ECU and other) cost's 1500-2000 USD. RB25DET ~3000USD. And I need another differential, brakes, etc. - all this parts I need to buy separately. But I can buy RHD Nissan 300ZX about 4K$ in Ukraine without documents - and I'll get engine, suspension, brakes, wheels, gearbox, cooling system and air conditioning system, e.t.c. And about 300HP power versus 170-220HP from CA/RB turbo.
I dont know how you would go driving fast in the Ukraine, when i was last there the roads were pretty rugged!
In my city we have normal roads. And we haven't any speedcam's )) Yeah, some roads in Ukraine look like after war. But some are normal and some are perfect.