I often buy vintage tops for machine quilting. I don't think it does any disservice to the quilt or the original piecer to quilt them by machine. We have beautiful examples of historic quilts that were machine quilted right around the time that the treadle sewing machine became practical and affordable for the home in the late 1800's.
I recently bought my second Grandmother's Flower Garden and it's beautiful like yours, only with a solid jadeite green where yours is white.
It's not very wide, so I'm going to applique three edges to a repro print border to enlarge it to queen size, then quilt it the way I did the first one, with feathery flowers and tufts in the flowers and a leafy vine in the green background.
Here's the first one I did - I misjudged the binding and used a print that was too strong for the majority of fabrics in the quilt. I should have used something a little more nondescript and subdued. I appliqued the triangular pieces of repro solids along the long edges to make it easier to bind and more practical to use. The ends were very frayed and I ended up trimming them straight, which was okay - but on this next one, the binding will probably follow the "v" shapes of the octagons.
