If your reader lights up your LF xFD, then there is a good chance your NExT will work with it.
As your NExT comes in EM410x from DT you need to change that to HID
Now you just need something to read and write your card.
You have a couple of options available to you.
That will depend how involved in this “game” you want to be.
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If you want to get a few implants and have the flexibility to do everything you want, and future proof yourself I would reccomend you get a Proxmark3.
I see that you are getting one already and this is really your best option. -
If you want a simple tool, that just does the job, but only LF That will have you up and running quickly, I would suggest a Blue Cloner. ( there is a catch, but if you read my review, that will explain HERE )
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If you want somebody to help you out “locally” There is a community member in Philly that i’m sure would help you out, but you would obviously have logistics and travel to sort out