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Removing the "Blacklisted" tag from the mechdef won't get them in the OPFOR pools but it should make them available in shops but they will still be EXTREMELY rare unless you mod the rarity. I haven't figured out where the list of potential OPFORs for each mission type are kept.
 
I think you have to remove "BLACKLISTED" and replace with "unit_release",

also if you want the mechs in the stores you have to add

mechdef_atlas_AS7-D-HT,MechPart,0,10 for the atlas

just choose the store for example

itemCollection_MechParts_RestoPanzyr

just be sure to make a up back up of any files you change