There is a limited amount of androgen you can dissolve in the "lotion" . So it all depends on how many mg of addtional androgen you want to add.
The premix as it is, is already at a very high concentration. Hence I would not add extra to it.
As for shelf life, the estimate is 1 yr if you freeze it. But no one has actually done it. So we don't really know.
I have a feeling that BDC will find someway to continue to make the products available to us, eventhough they may be in different format.