Hograth Podkarmen:
1) Are the melee versions of this acceptable techniques here?
Those Techniques are cleanly in DF as the "Slayer" series, IE Slayer Swing at Neck. Slayer Swing at Skull, Slayer Thrust at Vitals, etc, so yes, they are perfectly acceptable as melee Techniques.
If you use the same techniques more than once on an intelligent foe (or where you can be witnessed by an intelligent foe) they get a +1 to defend against that attack when it's used on them.
You can even make them part of a Trademark Move.... however that just means the above "they see you doing it" becomes a bit easier for them... and some inyelligent enemies will have heard about your Trademark style in advance!
Trademark MoveĀ (Perk)
A Trademark Move is a prescription for a full turn’s worth of combat actions. Write down every detail when you buy it; e.g., “All-Out Attack (Strong) using Broadsword, for 2d+3 cutting, thrown as a Rapid Strike with a chop to the neck, at skill 13, followed by a Deceptive slash at the torso giving -2 defenses, at skill 14.” Damage and attack rolls can improve with ST, DX, and skill, but all weapons, maneuvers, combat options, and hit locations remain fixed. In return for committing a point to such a specific move, you’re at +1 on all skill rolls made to execute it exactly as written – no substitutions.
A Trademark Move must be distinctive – no “Attack with Broadsword to torso.” The GM is free to forbid one that isn’t!
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2) Is a crossbow version of the Tactical shooting an acceptable technique (or series thereof) here?
Probably. Personally I'd allow them as 'Crossbow' variants. But I'm not the GM...