I'm at a computer so I can add a bit more to my response.
Let me begin by saying that I simply see no reason whatsoever to take actual courses at Excelsior (EC) and transfer them out. This would be an incredibly expensive option and offer no substantive value over dozens, perhaps hundreds, of other options. I would take that off the table and forget about it, bad, costly idea.
If you are really sold on Liberty then utilize whatever options you can to reduce the cost such as CLEP and Straighterline, then just go get your Liberty experience. A cheaper option and arguably better would be to go to a CC first then transfer the whole thing to Liberty. That would keep all those general education costs in order and allow you to build afforbale credit before taking the Liberty plunge.
I don't think many schools will allow you to be enrolled on your own at a separate institution. Usually when one does this you are enrolled at school A then you take courses as a transient student at school B. Typically this is organized into what's know as a consortium agreement. A consortium agreement insures your credits from B will count at A and makes the proper use of any financial aid possible.
If money is the issue go get your AA/AS first and transfer that to Liberty .... you could accumulate as much as 3/4 of the total degree (90 credits) this way. Completed at say, your local CC, Luna CC or NMJC this would bring the first three years of your total degree down to something like $3000 (less with the efficient use of CLEP). That cost could be spread over a couple years leaving you with just 10 or so courses to take at Liberty
Transfer Policies | Liberty University Undergrad Admissions
Note that Liberty requires 30 credits in residence, and that half of your major courses must come from them. I think it would be better to satisfy general eds and relevent credit up to 90 elsewhere while reducing overall cost then just go to Liberty for the Major requirements....degree will read the same in the end but be had for a rock bottom price.
