the subscription price is below the market price, page-10

if you are eligible for the SPP then sure you can sell what your holdings are now on market so you have cash to participate in the SPP at a lower price than current market.
points to note

- you only get 1 application
- you aren't guaranteed to get your requested allotment
- current market value could be different at the time the SPP shares are listed, there will be dilution of which the market will determine if is enough to drop the value of the shares in total