Of course, given the FAA's current thinking, the whole thing may be moot...

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From AC 91-75

b. Replacing the rate-of-turn indicator will mean losing an easy reference
for standard rate turns. However, in today's air traffic control system,
there is little need for precisely measured standard rate turns or timed
turns based on standard rate. Maintaining a given bank angle on the attitude
indicator for a given speed will result in a standard rate turn. Pilots
using this AC to substitute an attitude indicator for their rate-of-turn
indicator are encouraged to know the bank angle needed for a standard rate
turn.

NOTE: The FAA preamble language for the 1970 amendment to section 91.33,
re-codified to section 91.205, states: "[T]he FAA believes, and all other
commenters apparently agree . the rate-of-turn indicator is no longer as
useful as an instrument which gives both horizontal and vertical attitude
information."

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So you may soon be seeing students who have never flown a turn
coordinator...