Project Grailsword\Contqual Part 2

I have been mulling over some possible Iron Hands Chapter Tactics, i have thought about 2 possible tactics, one im thinking is for the Iron Father and the other for either the Clan Commander or a Venerated Dreadnought.

Tactic One
If you include (x) than all units in the Iron Hands army lose the Combat Tactics special rule. Instead, all HQ choices, Techmarines and Sergeants gain the Feel No Pain USR. If more than one character in your army has the Chapter Tactics special rule, you must choose which version will apply.

Tactic Two
If you include (x) than all units in the Iron Hands army exchange the Combat Tactics special rule for the Stubborn USR. If more than one character in your army has the Chapter Tactics specail rule, you must choose which version will apply.