make it more pleasing to the non-cyclists who look at it
That’s the first thing I thought when I went to the already mentioned LUBP, what with it being a multi-use site. A bit of clever landscaping, at least grass the in-between bits where weeds take over. Would make it look less like bikers have bowled up and taken over. At Leeds there’s massive grassed areas which could easily have a few picnic tables scattered about, so in the summer families and none bikers (local Special Brew & herbal enthusiasts) could chill out, sun bathe and watch from the side lines well out of harms way, without the need for any fencing!
Your site is a lot more penned in/sectioned off already. Oh and sorry for the lack of helpful suggestions. Be interesting to see what the STW green fingered geniuses come up with!