Without the seat, it is unlikely for the crew to survive a forced landing. The canopy should be jettisoned as the first step in the ejection sequence, at least, it is modern seats. Aerobatics generally has the pilots wearing chutes and having made a silk letdown after a mid-air; I wouldn’t get in one of these jets without an operational seat and the associated training. Ya just never know.
PS: Yes, the canopy goes first, in my experience.
GF