Do we have a fighting chance at showing feasibility when we will only have 3 weeks’ worth of pay stubs to show?

First things first: you need to retain a skilled BR lawyer who knows the practices in your district. It's almost always worth the effort. Second, step-up plans are disfavored under the eleven-year old Bankruptcy Reform Act. Third, you do have a fighting chance. You will need evidence to respond to an objection at the hearing on it. Prof of your earnings from the beginning of the job through the week of the hearing. Testimony from the supervisor or owner of the business that what you are earning (or whatever is the truth) is typical, or reasonable to expect you to continue earning. and your BR papers will show what your expenses are, and of course the Means Test must show a final number which you can afford, and when added to your secured and priority claims, pays at least the minimum which in your case you must pay. A lawyer generally makes the whole process much simpler.

Of course, a long term stable job history is better evidence that the job will continue for the 3 to 5 years of the proposed plan than a job which was only begun a few weeks ago. However, no job is secure for the next 3 to 5 years (sure, teachers and other non-accountable government employees can't be fired but they can lose their job because of illness or disability or they quit to pursue something else). Now that you have a job, the court will presume that it will last the life of the plan and I've never seen a trustee attempt to dispute that. Once the trustee is informed of the new job, I predict that the trustee will withdraw his/her objection to your plan.

Sounds like you are doing this without an attorney. I would recommend that you pay an experienced BK lawyer to review your file with you and your options. You should pay for about 90 minutes of their time.

The trustee is likely to accept the wage information to overcome the feasibility issue at some point. It might not be unreasonable to have the trustee delay confirmation a few weeks to make sure that this job is secure. Unfortunately, you are asking for assurances from people who do not know who your trustee is and cannot review your paperwork. You take a terrible risk in filing a Chapter 13 without an attorney, because the success or failure of your plan is often based on the personal relationship the trustee has with the attorney representing you.

You need to hire an attorney for a chapter 13.