Yes there is.
Try using Gedemon's tech pace mod. Find it in the Creation forum (mod components I think). Read the posts. You can adjust the cost for the techs to whatever you want. So you can make the cost of a civic or tech take, like, 30,000 turns. This is what I myself will be doing shortly. I don't think I've ever hit 30,000 turns on a game.
I might even try a game where I play on Standard, so production is normal, but boost cost of faith units to about 300x the normal amount, then put ancient techs at 10x, classical at 40x, middle ages/renaissance at 100x, industrial and beyond at 1000x. And use the mod that limits boosts to 25%.
There was a series of mods for V that limited the game to certain eras. While probably more of a pain to do with this VI, I'm almost certain we will see this series again, and probably not too far in the future.
But if you use Gedemon's, be sure to read all of the posts. There is some interesting and useful stuff in that thread.