Find some seeds of that strain or grow some bubba kush and Purple Kush, wait for some males to show up and collect the pollen for cross then grow more from there. Im
Simplifying a method that would take you awhile to reach such a strain but bear in mind, youll know exactly what you are growing.
I am aware of one person who grows a clone of pre-98 bubba. These are highly coveted strains but Should you follow through or find some luck, keep going.
Most people would be willing to buy from you to cover your cost
Providing your yields permit you to.