My take:
Good condition used Kubota tractors are pretty 'liquid'. Take advantage of this.
The hassle and time involved in adding PS to the B7300 doesn't seem worth it, compared to the option of buying another tractor and selling the B7300. Keep in mind the OP wouldn't be doing the conversion himself - the task of finding someone to do it, and do it right, is significant and risky.
Buy another tractor. Sell the B7300.
Good condition used Kubota tractors are pretty 'liquid'. Take advantage of this.
The hassle and time involved in adding PS to the B7300 doesn't seem worth it, compared to the option of buying another tractor and selling the B7300. Keep in mind the OP wouldn't be doing the conversion himself - the task of finding someone to do it, and do it right, is significant and risky.
Buy another tractor. Sell the B7300.