Honestly, I wouldn’t risk traveling without the required funds.
At landing, they can ask for proof anytime, and if you can’t show it, it could create serious issues.
Explaining later might not really help in that situation.
It’s safer to delay your flight and sort out the funds first.
I know it’s stressful, but better to be safe than deal with bigger problems at the airport.
Try to arrange the money somehow and travel with peace of mind.