The mag disconnect is somewhat easy to remove.
I'd give Jess at On Target Custom a call, he should take on just doing a few tweaks.
I bought a full gun from him and I'm very happy with it. With the added C&S safety it's more like a 1911 thumb safety, and he may start working on a hybrid thumb safety based of a C&S safety with a different lever welded on.
I know in talking with Jess that he's looking to lessen the amount of full from scratch customs and is looking to increase his work load with just a few changes to customer guns.
Probably worth giving him a call, I don't know what his current back log is, but the work is top notch.