QT qmake start a process on target afer deploy

Question

I'm working on a embedded Yocto Linux project that runs QT applications.

Here are my requirements:

1. I need to deploy binaries and all of their systemd units as well as a custom target for some of those units.

2. I need to simlink some of those units as wants for other already installed targets on the OS.

3. I need to set the default.target as a newly deployed target.

4. Maybe do a systemctl daemon-reload.

Currently I have something working but it's very much coupled between OS build and QT build systems and I was hoping to have more separation. QT deploys to correct folder however the simlinking is done by a bash script that's part of OS and bitbake starts it as part of OPKG postinst instructions.

Qmake code for handling systemd units:

TEMPLATE = aux

UNIT_FILES += \
    ./Targets/main.target \
    ./Targets/additional.target \
    ./Units/unit1.service \
    ./Units/unit2.service \
    ./Units/additional.service \
    ./Units/neededByOSTarget.service

boot2qt: {
    deploy_unit.files = $$unit.files
    deploy_unit.path = /usr/lib/systemd/system
INSTALLS += deploy_unit
}
OTHER_FILES = $$UNIT_FILES

Bitbake code for installing and enabling

pkg_postinst_${PN} () {
   # Simlink systemd units
   ${PKG_ROOT}/usr/bin/autoInstallHandler.sh -i ${PKG_ROOT}
   # Change the default target
   ln -sf /lib/systemd/system/main.target ${PKG_ROOT}/etc/systemd/system/default.target 
   /bin/systemctl daemon-reload
   /bin/systemctl start default.target &

autoInstallHandler.sh simply simlinks all of the units to proper locations

My question is can QT have something like what's in postinst? If not is there a better approach for this that maybe utilizes a different method?