Dear Elisei, thanks for your effort and patch!
boost1.74 will not be released with trixie (see #1060102 <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1060102>) as it has been superseded by 1.83. Removal from testing is scheduled on 05 of June. So, I do not see too much reasons for the NMU. Thanks again and best regards Anton