失礼をば
Meanings
1
my apologies; I'm sorry; excuse me
A polite, somewhat formal apology phrase. The をば is an emphatic object marker, giving a slightly old-fashioned or deliberate tone. Often used in business or formal settings.
See also: 失礼しました
I apologize for causing you trouble.
I say this knowing it may be impolite, but I believe that plan is unreasonable.