さえなければ

if only there were no

→ さえ
phrase Rare #36,476
if only there were no Used to express that something unwanted is the only obstacle, often with いいのに or a conditional result. It can also mean “if only I didn’t have” when followed by a noun such as 頭痛.
JA: 雨さえなければ、散歩に行くのに。
EN: If only it weren’t raining, I’d go for a walk.

英語の試験さえなければいいのに

If only there weren’t an English exam.

頭痛さえなければいくのだが

If it weren't for my headache, I'd go.

月曜日さえなければ月曜日さえなければ

If only there were no Mondays, if only there were no Mondays.

— Бриллиантовая рука (1969)

この欠点さえなければさっそく彼を雇うのだが

If it weren’t for this one flaw, I’d hire him right away.