I would accept the help if the condition is 50/50 or even 70/30 where the smaller portion is my share as long as I don't have any responsibility for the amount in case the bet lose.
While it's not safe, that scenario has no certain rule to it, I wouldn't go all in, and all the borrowed funds won't be wagered, unless it's made compulsory, which I won't comply easily. Half of the money gets wagered and the rest kept aside to face any form of challenge regarding pay back.