I have never seen a head gasket leak get fixed by any method other than taking the head off and putting a nice new one on.
You ARE taking a chance that the leak will develop to where it is putting water into the crankcase... and since water is heavier than oil and the oil pickup is at the bottom...that gets bad FAST...
It is your car... we don't know the other parts of the puzzle... do you have another car to use while you do the head gasket job ? Have the spare money to do it now ? Are you a risk taker ? Can you afford to go get a used engine out of a salvage yard on NO notice .. like stranded somewhere and have to have it towed home ?
We can suggest all sorts of things.. but we don't have any money on the line...
If you did your homework, had all the parts ready, and nothing went wrong ...you could probably do the head gasket in a weekend... but you would have to have your knowledge base and special tools lined up before you start.... and do it indoors so mother nature does not mess with you...
Now, on the other hand, if you are the type who would want to do a valve job while you have it off... that too is good planning...