It's not alot, to fit in... where is your pump? Just below the tank?
Setting up that way gives you the least restriction and most control over the plumbing. You can pull your pump easy, you can replace the flex easy, it's all set up to be easlily disconnected.
BTW, you should have a union ball vavle on the intake to the pump too, so that you can shut off the water from the tank and remove the pump from service for cleaning or replacement.
It's not the cheapest way to plumb, but you have all the flexibility to upgrade/swap/repair anything that may change later.
If you want to simplify, you can change this
1" union ball valve ---> 1" > 3/4 bushing -> 3/4 pvc ---> 3/4" female threaded to pump
to use 1" union ball valve ---> 1" >3/4 female threaded bushing ---> pump it's simpler but not as easy to find the 1"->3/4"threaded bushing.
Cost is like $4 for unions, 50-60cents for any adapter and $10 for the union valve. You'll be thanking me if you ever have a pump sieze
M.