Bike transportation - Diesel vans and clean air zones

I've had a VW Transporter as a mobile 'toy shed' for for 13 years; bikes, surfboards, windsurfers etc which i also use as my regular vehicle (ie when I'm not off having fun, although I also do use it for a part drive/park cycle commute). I live on the border of a clean air zone (CAZ) and pre-Euro 6 diesel vans are being targeted (not diesel cars - sore point with me). The van is in excellent condition (low mileage) but I'm going to be almost trapped by the CAZ so it'll have to go (and it is a polluting vehicle), although I still want to stick with a van. If I was well outside the CAZ I could have 'modified my behavior' and stuck with my existing van until it needed replacing. A Euro 6 van is the easy option, accepting that there is a risk that Euro 6 will be deemed 'bad' in the not too distant future but there may well be other van options by then. Electric vans aren't far away (within a year for VW) but the limited range is a non-starter for me. An additional runabout car (reduce reliance on the van) seems excessive and parking is limited for me. VW did a petrol transporter a few years ago but there aren't many 2nd hand ones, especially in the spec you're after. The council have said there will be grants/0% loans to assist people change affected vehicles (good if it happens). Anyone else in this situation?