Abyss path 4 and 5 other options instead of Human Torch

Hey, need help with Abyss path 4 and 5. I do not have Human Torch other than 4*. What are other options who will work instead of HT? Better to wait for HT for 1-2 years
or go with other option? And how do you think will it increase unit needs drastically for the run?

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Comments
It maybe useful.