Welcome Just_Me,
I'm immediately worried about that 'plane. I think the 175 had a non-standard engine. Better check out the details as, if it's the geared Roller, I think it is ask yourself why are there so few?
Cheapest planes with lowest running costs = LAA homebuilt on a Permit with a VW engine. You can buy things for sub 5 grand that burn 15 lit/hr and you do all the maintenance yourself.
I think the Self Improver Route is dead now. Others more knowledgeable will be along soon to explain the new way.
With an ICAO equivalent licence you can fly anywhere. JAR/FCL is good to go.
Good luck.
Sir George Cayley