Yes, that would be fine. Ammonia and Nitrite(NO2) are the only essential measurements and as you can tell, pH and Nitrate(NO3) are something for which you can just decide yourself how frequently you need to check them to catch something going wrong (ie. pH going to far down, NO3 going too far up.) The problem is that in both cases they do not go wrong gradually necessarily, sometimes it feels quite rapid, in hindsight. They also are the opposite of each other in reliability of testing (pH being the simplest and most reliable of the tests, NO3 being quite unreliable (therefor one benefits from a greater number of NO3 snapshots (possibly,lol) despite what a pain it is to perform the test.)
~~waterdrop~~