Is there a 100% homemade media recipe that doen't require replating?

[altcuban]

Hello guys I want to try pollinating and propagating a phal, I've read a lot of articles and posts and I'm worried about the media. I want to use a media I can make at home without having to buy it online. I know I will need to buy the agar and I have 20-20-20 and root hormone already. So is there any receipe for media that doesn't require a medium powder, just the normal stuff I have at home + the agar.
Also, I'm afraid about contamination when replating is there a media recipe I can use that will allow me to not have to reflask, one where the seeds can germinate and the seedlings grow until mature enough for deflasking. In other words a media that works for both so there is no need to replate. I know i will have to open a ventilation.

Thanks for your help.