I recently had occasion to visit the question of administering the Chalice (within the Extraordnary Form) to a communicant with gluten intolerance. I gather that low-gluten hosts are available and are valid matter, but that hosts without any gluten are regarded as not valid matter. If anyone has (not guesses and fluent woffle but) precise information better than mine, I would be glad to have it.
In any case, the pastoral situation did not afford the leisure to go into this question. I tried the Anglican practice of giving communion from the chalice after communicating myself from the chalice, and holding the Chalice tightly as I did so; the problem here was that the level of the Precious Blood in the Chalice was so low that I was unable to judge visually whether the Lord's Blood had reached the lips of the communicant. The second day, the lady wore gloves and I committed the Chalice entirely into her hands.
I recall seeing a video of a FSSP High Mass at Hanceville in which a small ancillary Chalice was consecrated and, I hypothesise, administered to one of the sisters at the grille.
Of course, for a communicant whose gluten intolerance is total it would be dangerous to communicate them from a chalice in which a fragment of the Host had rested, or over which the celebrant had rubbed his fingers so as to dislodge fragments adhering to them.
I am interested in (1) any relevant dicasterial instructions which may have been issued; and (2) any guidance with regard to practicalities which another presbyter who has faced this situation might be able to provide.