I have been doing TR workouts while entering a Zwift race for weeks. In my opinion, in order to get the better “racing” experience, you need to consider the correct w/kg group, racing route/timing and TR workout type.
My FTP is at 3 w/kg, but I often finish at bottom 50% at a D group (1 - 2.5 w/kg). Go for a lower w/kg group increases the chance of you staying in the pack. If I have to ride solo for most of the race, I don’t see a point putting myself into a race at the first place.
The race route and timing is important, too. If it’s rolling hills, the ideal timing will be your avatar climbing when you do interval workout and down-hilling when you at the rest period. If it’s the other way around, you may loose too much ground at up-hill and ride solo again.
Lastly, the TR workout type. I find long steady sweetspot workouts fits better than VO2Max workouts if average power is similar, especially on a flat course. It’s those 50% - 65% FTP resting periods costing you falling behind in a race. If it’s just a 1-3mins rest, you will probably be fine and catch up at the surge; but if it’s a 6-mins resting period, everybody will be gone soon.
I do enjoying doing TR workouts while Zwift racing very much. It certainly distracts my attention and makes those 4 x 8-minute near FTP workouts or O/U workouts way more tolerable. My focus would shift from interval minutes to how many seconds away from the front rider.