A googlesearch shows that flavour concentrate is available. I won't put links here because I haven't used the vendors who show it, but have you searched it yourself?
I'm trying to find out what the actual "bread crust type" flavor is. There are some flavors claiming the 555 flavor but I have TFA DK Tobacco which supposed to be like 555 and it's absolutely nothing like it. So looking for ready made blend probably won't help. I could get Hangsen DK Blend (HA) or 555 concentrate which is the right flavor but I'm finding nothing locally.