According to the link above Arachis pintoi plants can be easily propagated by rhizomes.
Ken Fern says:
There are no reports about this species becoming a weed. However, once established it is very difficult to eradicate, spreading by stolons for up to 2 metres a year in the wet tropics and about 1 metres a year in the subtropics.
So you might want to be careful and trial in a limited area first in case it doesn't work out.