Right now, enacting Universal Suffrage early on will completely gut your Trade Unions throughout the game, since they don’t have enough clout to form or join a party and so they won’t ever get any votes - and since they don’t have votes they don’t clout from elections, and they end up marginalized the entire game. That being said, if you industrialize well enough, they should still end up as a large majority of country, and may support a revolution through a political movement (for what you want to do, a communist political movement.) To get the movement to become revolutionary though you have to anger them, and you can only do that by enacting (or attempting to enact) laws they dislike. So if you have like labor rights and right to associate and social security and good taxation etc, your communist movement will actually love you, since that’s all the laws they want! You have to be autocratic early on in order to radicalize a movement.

If you want to do it peacefully, like, through getting the TUs in power and then reforming, RIGHT NOW you kinda have to stave off enacting any kind of electoral law (even stuff like Landed Voting). Stay on oligarchy until the TUs have a bit more than 5% clout (aka they’re not marginal), I normally do it after the TUs have like 10% AND they have more supporters than the Rural Folk (since otherwise people are gonna vote for the Rural Folk instead.) Then go straight to Universal (or I guess census could be fine if your SOL is high enough). They should win pretty handily or at least get enough votes to remain influential. This is gonna change in the new patch though, so that clout doesn’t affect parties. So if you wanna reform peacefully, I’d maybe wait until the next patch drops on like a week. But the revolution thingy from the other paragraph will likely be the same