Inscript and turn requirement

If I inscript a drain esse into a tremere, can I play the drain esses on the first turn?

I would believe yes, it looks like a tremere did a scroll and now has magic ready to use, but it seems controversial.

Cardtexts are required, as ALWAYS.

Name: Inscription
Cardtype: Equipment.
[tha] Put this equipment on a ready vampire and put a card that requires Blood Sorcery [tha] from your hand on it (face up, out of play; this acting vampire pays the cost of that card). The vampire with this equipment can burn this equipment to use the basic Blood Sorcery ability of that card.
[THA] As above, but the vampire can use the superior Blood Sorcery [THA] ability of the card.

Name: Drain Essence
Cardtype: Combat
Cost: 1 blood
Discipline: Thaumaturgy
Not usable on the first round of combat.
[tha] Strike: ranged; steal 2 blood.
[THA] Strike: ranged; steal 4 blood.