That's a lot of money to invest, and to my thinking the risk far exceeds the likely reward. Firstly there is no doubt there are many good choices for spending the money on quality training. But the reality at the end of the training pipeline will be predicated by your age. At 48 years of age, with what amounts to only a basic licence with no operational experience, your options will be very limited. Employers look for experience co-measurate with age, and that means at 48 you should be an experienced Captain on an RPT heavy jet, and not a CPL with 200 hours. Employers hire pilots as future Captains, and at 48 you are going to reach retirement age before gaining the skills and experience needed to make Captain.
That will be a very difficult hurdle to overcome.
The other thing is to take stock of your new career and what you want to achieve, being mindful that in all likelihood you'll be a career co-pilot with very little prospect of command.
But one has to admire your motivation. If you have the money to burn then go for it, and good luck. Just don't be disappointed if promises don't turn into reality.