@lordkiwi @ediblelandscaping.sc
See this thread https://growingfruit.org/t/scion-shop-annual-sale/58925/3 and try this link https://reallygoodplants.com/ there are scions of Elaeagnus latifolia of named varieties (chuck and mimosa) which is exactly what you are after. By named i mean they named them Gardening : Elaeagnus latifolia . For those who are not familiar Elaeagnus latifolia - Wikipedia . Think you could use Elaeagnus multiflora or Elaeagnus umbellata for rootstock during your experiment.