I thought we talking about the older PCB concretes you could get! Things have changed since I did 2mmFS!
Looking out of the window here, you'd struggle to pick out clips which are a 100 yds away. Once you come to S&C, which for your proposed scenario would be, IMHO, still on wooden bearers it may be worth using either chair plates from the Association or making youre own from shim. FB pointwork still uses quite substantial baseplates. In this instance using solder paste maybe be worth while as little extends higher than the foot of the rail. Though the larger Pandrols used on S&C are much more noticable than on plain line.