Damson suckers

Had my allotment now for just over a year and for all of this time there have been a number a what i thought was assorted fruit bushes near a large old damson tree.

Now though my own research i think have have found out these may be suckers from the Damson tree itself.

What i wanted to know was .

1) should i let them carry on growing, hoping eventually i will get more fruit.
2) Dig them up and move them to another spot, in winter of course , so the area looks tidyer and so i can keep a better eye on them, train them with the hope that they will produce more fruit.

3) use them as rootstock for the main damson tree when i can take cutting or try and find another source of say plum cutting i can graft them too(and yes i know this is done in the winter too ), this idea does apeal as i try and be quite frugal and the idea of creating my own fruit trees i feel is a good one also it will enable me to practice grafting.

4)Or just get rid of them all as they wont really amount to much .

There are quite a few, even some blooming, but also some smaller ones so sure il keep ya in mind