After pondering your dilemma, it struck me: I’d never recommend anyone in the PNW grow a peach tree.  How’s that for nearly forty years experience

Regarding top-working, I’ve grafted, too.  Peach trees are not easy, they’re generally budded (as are most fruit trees).  If you’re counting on placing a successful scion graft at the end of each limb, I’d hate to see you further discouraged…

John’s advice is sound, and he’s experienced.  Though, I envision his Plexiglas airborne with the East Wind

Here's what I just recommended regarding Peach Trees: My advice to others became, if you want something different, try an Asian plum.  If you need something more exotic, try an Asian Persimmon.  If still in need, either a Desert King or Brown Turkey Fig..  

One of the best aspects of having been a longtime member of the Home Orchard Society was my introduction to fruit (such as listed above) that I was unaware of..  Like ...Asian Persimmons, with their magnificent foliage, insect & disease resistance, no need for pollination, large, seedless, consistent fruit on compact easy-care trees..  They replaced several of my former peach trees, and I'd bet your dogs would love them ~

..In the Piedmont, or the Coastal Plain?  Either way, that’s different.  I’m a couple thousand feet above (Blue Ridge, 6b), with some productive, though neglected peach trees just down the road…  I like neglect, thus all of my former peach trees in the PNW were replaced with the trouble-free alternatives mentioned above.  If it ‘needs spray’ - ‘no way’ ..became my pledge.  

I don’t know that many, if any on this forum can advise you on sprays or pests ‘over East.’ [perhaps part of the reason for our recent demise; we're too regional ]  After 5 solid years here, I can’t.  Honestly, with the Summer Humidity over here ..I don’t know how they survive at all   Though, I’m not past ‘spraying’ in order to save my grapes, apples, pears or Asian plums.  So far, no need..  

Here’s a found ‘suggestion’ on Plum Curculio Control: “Plum curculio control begins in the spring when overwintering adults emerge. Insecticide for plum curculio should be sprayed at petal fall and first cover stage for hard fleshed fruits. Two additional applications at seven to 10 day intervals are best. Spray for plum curculio in soft fleshed fruits, like peaches and cherries, at the shuck split and first-cover stages. If the flowering season is cool and dry, additional applications may be necessary. The adults may delay emerging until the weather is warm and wet. The best spray for plum curculio is phosmet or carbaryl. Always check the label and follow the instructions.”

So, ‘Carbaryl’ - “Carbaryl (Sevin) is not highly toxic to humans and quite effective against many insects. It is more toxic than either malathion or diazinon to bees and beneficial insects, so its use should be avoided whenever possible. ... Carbaryl remains on plant surfaces much longer than most other insecticides available to homeowners.”

I’m of the ‘Sevin & Malathion’ era ...(don’t know if you’re near Midlothian VA, but I cracked up a produce guy there calling it Malathion ) ..and no cancer yet..  Sounds like infiltrated fruit drops long after the first application/s.  

My ‘advice’ regarding scion grafting peaches stands, for me at least.  Their ..piffy wood and susceptibility to moisture transmitted disease seemed the reason for failure back in the PNW..  I’d expect to end up with a mutilated tree, with, at best, a branch or two of ‘the new variety.’  And, that variety would be as susceptible to those boring pests as the original..