Now that my Fps is above 30 for most planetary activity, I've been trying out the on-foot missions. Although I'm finding them entertaining but they feel isolated from the space part of the game.
I would suggest that if you are flying to or from a mission location in your own ship, there is an interdiction from an NPC ship connected to that mission. This likelihood of an interdiction or even many interdictions, would be based on the threat level of the selected mission. It's a similar idea to the existing mechanic where in some space transport missions you get told one or many commanders have been sent to stop you.
I would suggest that if you are flying to or from a mission location in your own ship, there is an interdiction from an NPC ship connected to that mission. This likelihood of an interdiction or even many interdictions, would be based on the threat level of the selected mission. It's a similar idea to the existing mechanic where in some space transport missions you get told one or many commanders have been sent to stop you.