I decided that I didn't like the old deck. Having designed the perfect deck on paper, I was researching what materials I need to make my own custom deck when I stumbled across one that matched my design to a T for a modest £45 online. That was complete with weird trucks and wheels.
I messed up removing those - bloody Allen key! Are they mental? Since time immemorial, trucks are held on with Philips-head bolts, and the nuts are easily accessible with yer bog standard skateboard all-in-one tool (which these weren't). TBH stepped in to drill out the shredded bolts for me. Trucks went in the metal recycling and I'll keep the wheels (they seem pretty good, the bearings are questionable but nothing a set of Bones REDS won't fix).
The new deck (top of pic below) is 2" shorter, has an elegant and useable shape (your feet don't get lost on half an acre of grip tape. If I get my front foot right and jump on, my back foot lands right where I want it); it has a 2 1/2" longer wheelbase so more stable and no front overhang; and a more subtle kicktail (enough is enough). The perfect 'cruiser' for rolling down the pavement*. No good for doing tricks or going fast downhill.