The reason you're getting the reaction that you are is that about once a month someone posts this exact question. BGist, has this idea about a child's student bass will be the best transition for them, plus they're cheaper, what do we think?
Universally, we advise against it. The OP usually argues that, no, actually it seems quite sensible and they either disappear or do it anyway. All of this begs the question...why bother asking?
(There is also a sticky on this, by the way)
About the time this dies down, a new thread by a new OP pops up and says "Hey guys, here's who I am. I got this idea, what do you think?" And away we go again.
I got my first Fender in about 1978. My uncle had a DB that I got to play with, but I didn't have my own until about 2001. I didn't want to be a beginner again, I didn't want to take lessons, I didn't want to believe that my preferences for strings and amplification couldn't follow me and I objected to the cost and lack of portability of DB's.
Personally, there is nothing wrong with playing jazz on an electric bass. Passive electronics, flatwounds and the right time feel and musicality will trump your equipment.
But, there is something magical and wonderful about swinging on a DB. I find it worth it and I'm certain that I've had playing opportunities that wouldn't have come to me otherwise. I also have paid for every shortcut I've taken. If you feel the need to do it, do it right. Make the investment, sign up for the struggle, swallow your pride, get some help and accept the process.
That's my advice. I'll go so far as to say, based on a well documented and discoverable history on this topic, that's OUR advice. Ask yourself if you came here for advice or validation.
Ultimately, as with all things artistic, you get to make your own choices and it really only matters how you, your audience and your band mates and future bandmates feel about it.