Yeah,it's a constant pain for sure. Looks like I'm not the only one!
I've had to learn to take opportunities when they present themselves,so like the rest of you,I work on what I can,then do the vocals later.
It has changed the way I write. I used to sit with a guitar and work songs out,now I just put down music and make a song later.
While I'm waiting,I try to stock up on lyrics for possible future use. This usually gives some cohesion to a song,rather than singing any old phonetic rubbish that fits,just because I need to get it done! Though,I have done that too.
@Boydie (the enabler)
banged on about KRK so much,I had to buy a set just to hear! He was/is right,they are a quality,neutral sounding piece of kit and much more comfy than my previous cans.