yes you could run T3 during this phase. my original example has T4 being ran in the cruise phase at I believe 150mcg per day with Clen. The reason I have T4 here with the Clen, is that together these compounds are both going to aide in fat burning, but are also anti-catabolic, possibly anabolic, and help re-sensitize androgen receptors . I do NOT have T3 in here as a stand alone as for some people it can be a bit catabolic.
But , you can add T3 on top of the Clen and T4 as well. you'll increase metabolic rate, feed efficiency, partitioning, etc.. and when running them all together, 'according to bro science', any un-coverted T4 has anabolic properties. so its not going to hurt running them all together.
on the other hand.. maybe you could use your explosives license and buy some of that stuff that starts with a 'D' and ends with a "P" they used to make explosives and pesticides out of
insulin would add a beneficial synergistic effect to everything I mentioned and benefit phases 3 and 4 quite a bit . even has protective benefits when using the 'yellow stuff' I mentioned.
But I would try to add a GH protocol to this as well to some extent, even if we are just talking a peptide like Hexarelin or GHRP6 or MK677.