Why do you believe signs are to only be used in a Tyler Lodge ?
General Remarks of the Emulation, by VWBro Graham Redman, PGSwdB, DepGSec (now Acting GSec as RWBro Nigel Brown, PJGW retired from the position), Senior Member of the Committee of Emulation Lodge of Improvement stated clearly that once the lodge is closed, it is inappropriate to do the signs.
And by the way we do not have due guards here. I have heard of a rumour that the due guard is the position when you take the ob.
if sings are modes of recognition and if we where already in a tiled lodge other than getting past the Tyler what's the point of them in lodge other than during instruction in degree work , interesting never seen a brother give a step accompanied by a DG , S&P outside of lodge though witch isn't really giving away anything to someone who doesn't know what's going on anyway a outsider would probably think you where giving someone measurements, or keeping your hands warm by a fire or fanning a fart 