What about a Parisjet2...Morane Saulnier MS880B? A really quirky geriatric jet that you can maintain yourself after a bit of learning. It's like a classic car, mechanics can fix them without expensive diagnostics. I had one for 15 years and it was great fun, pressurised to FL250, 320 kts TAS, airconditioning, everything is electric with simple mechanical back up for gear and airbrakes. The Marbore VIc engines are noisy, but that's not a problem except at big international airports in Europe.
I planned 750 litres for the first hour, 550 litres for time in the cruise. Really nice to hand-fly and built as strong as an ox, even if it looks like a flying Citroen 2CV.