My Boinc Remote script
here might be helpful
Its not completely transparent in that it does install a service called BOINC and it does put in into a folder called boinc in program files, however you can modify the batch file to change the path and name of the service.
Then you can roll it out to all the machines you are allowed to from your workstation, and then if you need to run it only at certain times you just setup a schedule on your computer to do the requisite commands at the time you require. Then all you have to do is make sure the machine with the scheduler on it is on at the times it needs to run the schedule.
For example you could set two scheduled tasks say called "morning" and "evening", create two batch files in the Boinc Remote directory called morning.cmd and evening.cmd.
So say your Boinc Remote directory is called c:\br here are the morning and evening cmd files
Morning.cmd:
@Echo off
c:
cd\br
br stop
exit
Evening.cmd
@Echo off
c:
cd\br
br start
exit
This would allow boinc to run overnight and stop in the morning