4-level stack manipulation on 12c

[Don Shepherd]

If my 4-level stack on my 12c contains:

t - don't care
z - don't care
y - 17
x - 5

and I want it to contain:

t - 17
z - 5
y - 17
x - 5

is there an elegant way to achieve that using only ENTER, roll down, and x<->y?