Pic sent mate
Gained 5"
But am sure you can change your outlet to a side turning one, into hose split hose with t piece into 2
1 goes through the pump into reels as normal
2 goes along hose with a in line hose tap in it and this can be used to fill barrels or back packs.
I think you should think about this way all bits will cost less than £40,
Tap outlet is about £26 inline tap £6 T piece about £1 bit of hose ?? U probly got loads of small pieces laying about
I would set the second one up using a second pump to speed up filling barrels and that.
U can get small 45 psi pumps for £15 and it be good enough.