The only magnified red dot I have tried was using an Aimpoint PRO and a gutted Hensoldt rocket sight (assuming 1" or 26mm tube?) and it was not close to the brightness level of my Steiner P4XI.
Is that just due to the smaller tube diameter of the Hensoldt and/or combining the 2 optics? Or is the brightness on any of the purpose built 3x magnifiers getting in to the same ballpark as the Steiner P4XI?
Better glass and big ocular lens most likely. A scope is built to be a scope and do scope things well. A magnifier behind a red dot is kind of a fix, not a true solution. Not say it doesn’t work and work well but a purpose built item is usually going to be better.
I liked my G33 behind a t2 more than my NXS 1-4 when both were set at 3.25x, except that with looking into lights at night (observing a lit area from a dark area), the g33 managed light scatter and glare notably less effectively.