Yes indeed, the filter of the Neutron is not too bad. It's not the same but might go about the same direction, how about Doepfer - A124 VCF5 Wasp filter? That's a nuts filter too :-) You can download the review report that I made about it (see my below mentioned website under my signature) and go to chapter 6 for some sound examples. Or use this link that takes you directly to that review report:
But... ehm... why you don't take the Neutron out of your rack and put it back in it's original casing and then keep using it? I love the LFO of the Neutron, so useful once and a while. I have the Neutron still in my rack as well but I am going to put it soon back in it's original casing, as you mention, to free up some rack HP space; but I will still use the Neutron as well, no reason not to...
Good luck with whatever you decide (please let us know) and kind regards, Garfield.