How can I bundle different installers from third party vendors to ease end-user installation process I have to deploy a few packages to all our users working from home (private iMacs/Laptops)
Is there a way to bundle multiple installers and Java JRE for them? What about authorizations and custom options for example?
pkgbuild and productbuild
Apple provide two command line tools for creating installer packages on macOS:

pkgbuild
productbuild

These tools handle authorization. Options are handled by the distribution file passed to productbuild.
autopkg 
autopkg is an open source tool popular with Mac administrators:

AutoPkg is a system for automatically preparing software for distribution to managed clients. Recipes allow you to specify a series of simple actions which combined together can perform complex tasks, similar to Automator workflows or Unix pipes.