I think the skip should be in the form of unlocking a mission. For example, a “mission key” purchasable for an amount of platinum would allow the player to play a new mission and skip mission requirements.
The only caveats would be other in-game necessities for the mission. For instance, if the mission requires a Railjack then the mission should prompt the player to purchase the cheapest version of the Railjack in the market, prior to redeeming the “mission key”. That way, certain missions have a higher barrier to entry and it encourages playing the normal way.
That being said, there should be a New Player deal/bundle, so the new player isn’t given a bad taste by a huge upfront cost to play a single mission.
Make the New Player bundle $60, give them all the essential gear for the different game modes. Some base starter mods, mission keys, platinum, credits and endo.
Maybe exclude platinum and the bundle can be refundable on Steam within the 2 hour window.