I'm personally fine with removing rocket/sticky jumping to the top, i understand the reasoning, and although i will miss how easy and fun it was to spawn camp, i get why it was implemented. but i believe Surfing should not be nerfed, to my knowledge, i only saw a couple people on the server able to surf up to the sky base on their first try (without using a rocket jumper as a boost) after they added kill barriers on the right side of the sky base. I think, in these situations, skill SHOULD be rewarded. My suggestion is, add a way for someone to reach the skybox 'quickly', just make it a difficult thing to do, and make it something that can be done consistently, as long as the player puts in the time to learn how to do it.
I have a couple suggestions on how something like this can be done; in between both of the teleports to the current surf, add a third one; this one will take you to a course. this can either be a surf course, rocket jump course, sticky jump course, trimping, etc. where it will either strip the player to melee (for surf courses) or give the player the appropriate weapon (rocket jumper, sticky jumper, shield, etc.) to prevent someone from going to a surf section and rocket jumping to the end; this will give regulars something to work on that could replace the time they spent going to the skybox and camping, as well as encouraging a player to become better at the game, meaning that non-donators could have an opportunity to actually get a leg up over a donator, as long as they put in the time to work on it.