A. Overall
i. I am concerned that you consider the Pearson price point to be expensive. That statement, combined with your desire to do something else, says "I'm not paid enough". Maybe I'm wrong. But if I'm right, if you're in a job, look at the salary surveys, and ask for a raise. If you're in PP, I would strongly encourage you to raise your prices, and ask private insurers for a raise. Look for reimbursement data online. Make some calls to your competitors' offices and ask what they charge per hour for a private pay session. Get rid of the bad insurances, or the ones that give you the worst patients.
ii. Look at jobs elsewhere. I know, I know, you have 18M reasons why you can't. But it might be cheaper to move to a new job than other options.
B. Retraining
i. You should not get training from a test publisher.
ii. If you want to gain assessment training, there are a few programs from educational institutions. That would take about 2 years, with tuition costs, and then you’re looking at a minimum of $3k to buy enough tests to get started.
iii. You should really explore exactly what the assessment market looks like. You would not be qualified to perform neuropsychological testing, relative to the HCG. That leaves a small corner of the assessment market including educational testing, and/or pre-employment testing for industries that require that. How much can you charge? How many can you realistically get? Where does the writing time go into your schedule?
iv. You could also enter the post doc match, and try things that way. Living as a post doc in middle age would be financially devastating for retirement.
B. Other ideas:
i. Get an MSCP, move to an RxP state, and prescribe. If you dislike psychotherapy, I don't know if that would be a better option.
ii. Re-specialize in IO through an educational institution, or get an MBA. Figure out how to apply your skills to an industry in a way THAT IS ACTIONABLE. No one cares if you show up and say some vague things. An industry wants to hire a consultant, who provides actionable recommendations, that result in increased profits in dollars and cents. This market is highly competitive, and you're going to be wearing a suit every day.
iii. Get better at marketing your practice. Spend some money on new furnishings and a new website. Wear something nice, get better patients.
iv. Run groups. That pays so well. Get supervision if needed. Attend some training like from Beck or something.
v. Become a court mediator. IIRC, states have training programs for that. Pays well. Nice offices.