infrequent
Well-known
Anything I would suggest by way of general precaution would be to avoid carrying a camera bag and perhaps sticking to one camera for the day (always by your hand) but it seems you are already doing that. Basically anything that won't draw attention to yourself and stand you out as a mark. It would be interesting if you just took the X-70 and that would be what I would do as well except it would be my x100s. Have you considered perhaps the X-T2 with a wide/normal lens and using your iPhone as the wide option? Let us know how you go after the trip and which one you ended up using more!