Ball joint spacer lift - Hilux IFS

Don’t know but Supalift USA do a similar thing to lift the IFS on the Explorers by 4-inch by dropping the torsion bars, Front diff, and control arms with brackets.

I think anything you manufacture yourself you could have problems with but.

Might be worth getting an engineer to have a look as the load on the balljoint and the A arm has changed.
I'm no expert by any means but the further you shift the pivot point (in this case the actual ball joint itself) from the A arm mounting point the higher the load on the A arm.
It may not be enough to worry about but if it was my vehicle I'd want it to be safe for my family and other road users.
It is probably an illegal mod without certification too.
Is the hilux drivetrain capable of handling larger tyre/wheel combos and is their fitment legal according to the tyre placard.
Might all be an insurance and rego nightmare.

The first thing Vicroads will look at is the increase to allow for 'big rubber'

You are only allowed to increase the diameter of the tyre by a max of 15mm over OEM specs.

and increase the width by a max of 25mm over OEM specs without an appropriate engineers certificate.

Change the Rubber AND the suspension, then I would respectfully suggest you are going to draw the ' crabs' something fierce if attempting to keep it legal.