I think the developers have already had this idea. I wonder what they think on it.
I have a mind that, as such, exclude classes and replace them with the option to purchase armor / weapons.
for example - originally a player speed 1. he buys laser armor (speed to slow to 0.9) and the Gatling gun (speed is reduced to 0.88). and etc.
There can be many variations and nuances (cant pickup weapons on the battlefield for example). But I wonder what you think of the concept ideas?

I Think all the variations would be hell To balance. Would Also mean longer learning curve for new players as you can make a lot of shitty choices

I think that's way too drastic a change to expect any time soon, but I like the idea and would try it when I get a chance.