If you are an Arkansas Mason and wish to continue your membership in Shriners International, then you must self-expel from Masonry. That's the GL stance for the past several years, both sides have set their positions in stone, and things are unlikely to change from present circumstances.
A number of Shriners have taken the option of demitting from the GL of Arkansas, and transferring their membership to a GL in another state where the Shrine is still recognized. The instructions I've received in that regard as SW of our lodge is that if I'm examining an unknown brother for admission into the Lodge, I need to check his dues card and compare it to his drivers license. If you have an Arkansas drivers license and a dues card from another State, that raises the red flags. If you're, for example, a Texas Mason and Shriner visiting an Arkansas lodge, and your dues card matches your drivers license, we simply ask that you respect the fact that we don't recognize the Shrine here and leave those discussions and related things outside the Lodge building.
Here's a copy of the most recent clarification from the Grand Lodge concerning the effect for members of the Arkansas Grand Lodge...