Tried it, it turns out if the cart is travelling above some speed, one block of slope isn't sufficient to stop it. I gather from reading the wiki previously that above a certain speed the cart effectively doesn't touch some rails (maybe that's above 20 blocks per second since the server has 20 ticks per second?). People tend to complain if the cart isn't going fast, so I don't want to go without powered rails before the station just to avoid the need for two blocks of slope.
I've started building it now since there were no major objections, but there were definitely complains about the existing temporary tunnel. The new temporary/work-in-progress one should be much easier to navigate. The rails do nothing, they're just there to try to stop pigmen from spawning. The dirt and cobblestone (except that under the rails) is all temporary. We can put real windows in once there's protection. If anyone has powered rails they don't need, donations would be appreciated, otherwise I'll see if I have enough gold. Thanks nutshell for the stone!