Have you guys looked at Cuckoo cycle?

It has very strong ASIC-resistance and even a phone can mine without orders of magnitude loss in efficiency:

"The most cost effective Cuckoo Cycle mining hardware should consist of a relatively cheap and tiny many core memory controller that needs to be paired with commodity DRAM chips, where the latter dominate both the hardware and energy cost (about 1 Watt per DRAM chip)"

https://github.com/tromp/cuckoo