Yep, that's exactly what I did. I just checked on my RO/DI gauge tonight and I guess it's now >100psi.
Just don't do what I did, I should have filmed this and sent it into Discovery as my entry admission request into "Canada's Worst Handyman", when I hooked up the plumbing to the tank room a couple months ago, I put the regulator back in backwards. THAT was an interesting phenomenon: when you open a tap first a huge whoosh of water, then it would slam shut (reverb throughout the house) and then trickle up and down. I was all .. WTF is wrong with the water? Then I noticed the regulator had a little arrow on it and it was pointing the wrong way.
I gotta admit though, I love cutting pex pipe and crimping new crimp rings on them. Man I wish it wasn't $200 for a pex crimper. I'd go hogwild with one. Ker-crimp!! Ker-crimp!! ... Whee!!!!