I would read the partic.
ἐπωφελήσας (which the iambic metre allows), and take
ἐξελέσθαι as the absol. infin. expressing a wish:—
"and would that I had never received that choice gift from the city, for having served her."
For this absol. infin., with the subject in the nominative, cp.
Aesch.
Cho. 363:
μετ’ ἄλλων δουρικμῆτι λαῷ
παρὰ Σκαμάνδρου πόρον τεθάφθαι,
πάρος δ’ οἱ κτανόντες νιν οὕτως δαμῆναι
. Orestes had uttered the wish that Agamemnon had fallen in war at Troy:
εἰ γὰρ ὑπ’ Ἰλίῳ | … κατηναρίσθης
(345 ff.)
. Electra modifies it:
"I would not have had thee to perish e'en beneath Troy's walls, and to be buried by Scamander's stream; would rather that the murderers (Aegisthus and Clytaemnestra) had first been slain as they slew thee!"
Here the MSS. have
τέθαψαι
and
δαμῆναι
. On the latter the schol. has
λείπει τὸ ὄφελον
, and on the former
λείπει τὸ ὤφελες
, thus indicating the certain correction of H. L. Ahrens,
τεθάφθαι
. Cp. also
Od. 24.376
αἲ γάρ, Ζεῦ τε πάτερ καὶ Ἀθηναίη καὶ Ἄπολλον,
τοῖος ἐών τοι χθιζὸς ἐν ἡμετέροισι δόμοισιν,
τεύχε’ ἔχων ὤμοισιν, ἐφεστάμεναι καὶ ἀμύνειν,
"Ah, would to father Zeus,...that, such as I was when I took Nericus,...in such might, and with armour on my shoulders,
I had stood by thee ,
and had been aiding thee , yesterday in our house!"
A criticism by Wecklein is discussed in the Appendix.