Didn't know these existed until I saw the ad:
https://www.gumtree.com.au/s-ad/rockdale/cars-vans-utes/rare-black-2005-volvo-v50-manual-mechanically-excellent-quick-sale/1268066650
Presumably it is tragically slow.
Wikipedia tells me that it has a B4184S11 engine, but doesn't tell me that a B4184S11 is actually a variation of the Mazda L-series/MZRDuratec donk.
Purely as a hypothetical, it means that a BL Mazda 3 SP25 motor would bolt in and would nearly match the NA B525's power output (122kW vs 125kW).
Alternatively, an MPS motor with 190kW is significantly better than a T5's 162kW...
...assuming that you could sort the electronics.