Quandary: I am happily running MacOS Mojave on a 2009 C2D Macbook Pro (via Open Core Legacy), and would like to port a painstakingly tweaked-for-years user settings and installed software to early i-series processor-equipped machines of the non-metal era. As it appears that a solution hack-enabling hardware-acceleration on non-metal Macs is not forthcoming with Mojave, my intention is move all user-account settings to the last MacOS version that ran adequately on those machines: High Sierra. Naturally, the otherwise ideal solution -- the Migration Assistant -- won't let you do that, which relegates the user to laborious reinstallation and settings tweaking of dozens of applications.
Goal: trick the Migration Assistant into importing a user-account from a newer version of the OS. (This will probably entail cloning the source OS, in this case Mojave, to a new temporary drive partition, then stripping out and/or replacing various software bits that the tool checks for. --It is not necessary that the temporary drive partition remain bootable, only that it be rendered kosher as an import source by High Sierra's Migration Assistant, and that the High Sierra destination user account successfully boot after importation. There will probably be other clean-up involved afterwards, such as too-new application versions that will need to be backpeddled, but that can wait.)
Assume possession of any required MacOS installation files, knowledge of disabling SIP and Terminal use, possession of cloning tools such as Carbon Copy Cloner 5 (if those are necessary in your ventured solution), and knowledge of proper drive preparation.
Goal: trick the Migration Assistant into importing a user-account from a newer version of the OS. (This will probably entail cloning the source OS, in this case Mojave, to a new temporary drive partition, then stripping out and/or replacing various software bits that the tool checks for. --It is not necessary that the temporary drive partition remain bootable, only that it be rendered kosher as an import source by High Sierra's Migration Assistant, and that the High Sierra destination user account successfully boot after importation. There will probably be other clean-up involved afterwards, such as too-new application versions that will need to be backpeddled, but that can wait.)
Assume possession of any required MacOS installation files, knowledge of disabling SIP and Terminal use, possession of cloning tools such as Carbon Copy Cloner 5 (if those are necessary in your ventured solution), and knowledge of proper drive preparation.
