You never know, the same roadblocks might have as today. forget engine.
It is not sure a design change might have accelerated the programme. After all French were consulted for the current LCAs too for number of problems. then came with the solution of new engine with more thrust.
Which is why I maintain.. even with a good successful aircraft.. the LCA concept as defined to its customers has not been successful. Simply because of the many hurdles and faults in the way. Just like the F-35.
But.. the reward of the LCA program is in the journey.. not the destination.