Even if you don't get the idler pulley for a few weeks, you can still complete the majority of the conversion. In fact you could probably test start the thing to check it starts and runs for a brief period, as long as the battery has good charge. The SC will run via the bypass with the drive belt not fitted.
Yes your right
I can get it done, I just have to believe
I am a bit of a worrier at times for no reason