For your leaky unions, have you tried
silicone lube on the o-rings ?
For your enductors;
Are you going to use 3/4" enductors on 1" pipe ?
If so, what about 90s threaded on both ends
If your eurobrace is wide enough, you unscrew the enductors, then spin out the 90s
You'd need a spig x fipt reducer bushing and a close nipple for each fipt x fipt 90
If not, all that comes to mind is adding 4 more unions.
One on each side of the Ts and 90s that sit on top of your eurobrace.
It'll cost you some money to experiment with it, but a dry fit will show if you can wiggle them out or not with the outflow 90s in place