My pastor instructed the parishioners who have intolerance to gluten to place a gluten-free host in a small ciborium (a bit bigger than a pyx) at the entrance before mass, which will be consecrated during the mass. Everyone knows that these people are to receive first in the communion line. I am unaware how many parishes adopted this practice, but you may want to check with parishes in your area if you have a need for this. It works very well here, and the pastor gave instruction both from the pulpit and via the bulletin several weeks before it was begun.
Since our pastor gives communion first to the handicapped, and then to the communicants at large, this is handled by an EMHC. I’ve only seen about three who have this need. After they receive, the EMHC places the empty ciborium on the altar, and continues distribution as normal.