But there is doable something more simple... completing a missing node, pathing and locking it normally into network - exclusive support from XC_Engine (oops I already did it). Until this moment this was already doable in some steps but... it can be even more simplified with an option using a common old variable.
This update probably will come soon (after more tests) and working this way + checking chain integrity...
Pointing that builder works not only in prior versions of UT, but also it seems to work in 469d - using corresponding XC_Engine version... which is currently under construction...