Well, I'm not clear on the limitations of live ISOs but since you were able to install linux- image-4.14.0-041400rc5-generic_4.14.0-041400rc5.201710152230_amd64.deb, it shouldn't be any harder to install the .deb for intel- microcode-3.20170707.1~ubuntu17.04.0 or newer. I suppose try rebooting first with just the updated microcode installed and validate that /proc/cpuinfo shows a newer version, and then reboot with the new kernel additionally.
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