>>2587585>it is possible to graft a peach scion to a plum rootstockYes, you can graft most species of the prunus genus on each other.
Some combinations are known to work better than others, in EU the cherry plum is commonly used general-purpose rootstock.
Peaches are also commonly grafted on peach seedlings.
>grafting ... Should I go for itDefinitely yes.
>Is it likely to succeed?It's slowly getting the right time for budding. Peaches are usually grafted by budding.
>Should I try to dig some of the plum runners up and keep them in pots in a sunnier area for this?I'd recommend to graft first, then move if the graft succeeds and heals well (so at least in three months).
Grafting on weakened plant is less likely to succeed. A year in shade won't matter for the peach.
Also, in summer it's better to graft when the rootstock is actively growing (and is not water/weather/… stressed)
>tips or general guidance for grafting1) check which type of graft yields best chance to succeed in your case
2) watch a few youtube videos
3) use razor-sharp knife
4) get straight, clean cuts
5) cambium of the rootstock must touch cambium of the scion
6) you don't need super-graft-tape, even cling film is fine for wrapping grafts
7) success depends on a chance, but using right tools, right graft type, right time, high precision etc. boosts your chance to succeed