I would suggest that you discuss this with your IP - if there is a good chance of you getting a job fairly soon they might be happy for you to tag the missed IVA payments onto the end of the arrangement.
Regarding BR, if you were to go BR it is highly unlikely that the petition would be rejected. I am working, and I have a reasonably well paid job but I went BR - it doesn't matter about the job, it's whether you can afford to repay your debts. If you decide on that course of action you wouldn't have to pay your IP from your first month's wages as you would need the money to pay your BR fees. Also check the wording of your IVA - some call for the IP to retain enough to pay for BR, but it would depend if you have paid enough into the IVA to cover the IP fees.
Before you do anything else you really do need to speak to your IP - one of the questions that the judge will ask if you go BR is whether you have taken advice and know the implications of BR.
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