Well, your need for a different vaccine for Delta variant is like asking for a different kind of stop sign for each type of car. No, all stop signs are fine for all cars and the current vaccines are fine for the delta variant and stop making up problems when they don't exist.Well, it was said that RNA vaccines are very easy to adjust. Delta variant has been ide tified almost a year ago, so should the vaccine for it not be out already? The way it looks, the scenario is playing out same as with a flu shot, by the time the updated vaccine will be out, it is going to be out dated. As everything going on this is a guess...
From the US CDC...
