[Serusers] enum using lcr...thoughts

Hi I was looking at standardising one of my configs, currently I use enum before sending the call out if no match using gw and lcr stuff. Would it not be better if I could use lcr functionality and add a "primary" gw for each prefix. Now when a number is dialed, lcr sends it out to this gw, this gateway then performs a number of lookups , albeit prefix based or even enum, or whatever comes along if success simply pass new result back or send call out (undecided), if fail, lcr will fall to next gw, which will be pstn. I could do this within ser itself, but wanted to move the lookup outside of ser, and just make the lookup server behave like a gw, if succesful it would route the call out, if not it would send a failure back. Can this easily be implemented by just setting up another proxy, which just does the lookups, using either built in enum, and additional prefix lookup, or is this overkill, and is it better to just have small server sw running which does the lookup on incoming sip transaction. The reason for just setting up another proxy, is to test if the process itself would work....thoughts? If it worked then all calls whether IP or pstn based would be handled by lcr, and hence my billing , and rating would also fall into place. Iqbal