OK, this is kind of a repost/summation of all the "modpack" comments so far but here it goes:
It seems that the most functional application of this idea is to have a simple text file or the like, formatted so that vortex can read it, with direct download links that could simply be fed into vortex's download manager. A simple handler for mods that have been removed is all that might be required to address the problem of pulled mods. I, as a semi-decent programmer, see no issue with this whatsoever, nor a rule conflict present.