For anyone that has raced, you’ll know that the notion of “not riding above FTP” is a straight up untruth. You will go over FTP unintentionally (or intentionally), it’s just the dynamics of racing.
There is nothing wrong with doing FTP work above FTP. For me, there are climbs that I must go hard on due to my weight, if I don’t I’m saying “bon voyage” to the group. They take me over FTP.
Here’s an idea: 4x10 with alternating intervals just below FTP and just above.
Riding below FTP will not get you accustomed to riding above. Mix it up, do some Supra-threshold work and some just below.