I realize that it can be a bit daunting to read absorb all of the wrinkles and possible ramifications of the CC licenses. The one thing they all have in common is that they do not place any sort of restrictions on performances or display. Personally, I recommend that composers employ our own performance-restricted counterpart to the CC license
for items subject to full-force copyright (meaning original works and arrangements only, since ASCAP, BMI and other performing rights societies around the world do not collect on editions). This license is essentially a full-dress copyright with the exception that the file covered can be freely distributed, copied, and disseminated from user to user, only on a non-commercial basis, with no permission granted for either derivatives (whether arrangements or part extraction) or public performances. The composer, publisher, or other copyright holder remains the owner of the copyright. The score can contain all of the statements pertaining to performance and broadcast (which is really just a type of performance) you mention and can be a locked PDF, since part of the "no-derivatives" restriction prohibits any modification of the file. The work, once posted, should remain freely available at IMSLP.
The creative commons licenses are in force in a large number of countries. Since the above-mentioned performance restricted license is merely a single limitation upon a copyright, a license to distribute freely on a non-commercial basis only, copyright protection around the world still applies thanks to Berne and other treaties.