To simply answer your question and not get dogged with the stepper/driver selection. For a 1kVA toroidal transformer I would seriously recommend some form of inrush protection. There's various solutions for this from the simple to the less-simple. I prefer the NTC thermistors which are designed for this application, others on here will offer other solutions.

I would question why you're going for a 36+36 secondary, for the same price and range of transformer you can get a 70+70 secondary option. This would allow you to have two independent split supplies (rather than wiring the two 36+36 in series). It's a subtlety sometimes lost that it will help manage large instantaneous switching currents if all four axis step at once, for a given wiring solution for the control box. Your copper losses increase as a square of the current so reducing the overall current through the PSU is generally a "good thing". It costs you an additional rectifier and you can then split the smoothing capacitors across two supplies rather than bulking up on one supply, then try to intelligently mix the supplies for the four axis depending on your anticipated use. For me I split X and Y across two supplies (as the two most active axis) then marry X with Z and Y with A. How effective this is, I've not (nor will) done the analysis, but it makes some sense to my fuddled brain.