1) Yes, you can buy the extra land and follow the KLR act 1961 Section 63 of the act as below
Section 63. Ceiling on land. - (1) No person who is not a member of a family or who has no family shall, except as otherwise provided in this act, be entitled to hold, whether as land owner, landlord or tenant or as a mortgagee with possession or otherwise or partly in one capacity and partly in another, land in excess of the ceiling area.
1. Substituted by Act No. 34 of 1998 published in the Karnataka extraordinary Gazette on the 5th day of December 1998 w.e.f. [deleted]
(2) The ceiling area for a person who is not a member of a family or who has no family or for a family shall be ten units :
Provided that in the case of a family consisting of more than five members the ceiling area shall be ten units plus an additional extent of two units for every member in excess of five, so however that the ceiling area shall not exceed twenty units in the aggregate.
(2-A) The ceiling area for a person who is tenant under clause (b) of sub-section (2) of Section 5 shall be forty units.
(3) In the case of a family the ceiling area shall be applied to the aggregate of the lands held by all the members of the family, including the stridhana land.