Not sure about April but richmond is the beggining of may and is very easy, sj is on a surface and not usually too big and xc is very straight forward.
Pontispool is nice, but big IMO (big, but straightforwardand not to many combs), but a very long trek for u!!!
If the SJ should be fine and your flying round PN then any novice course should be fine!!! Just ride as if its a PN and enjoy it!!!
Good luck!!!