Pretty much to answer your question about vaccinating him yourself, yes it can be done. It's really very easy, since it's subcutaneous. There is absolutely no problem in your plans.
Follow the protocol from Jean Dodds and have him titered afterwards to be sure of seroconversion.
The only thing will be the rabies vaccination, it's not considered valid unless it's done by a licensed vet (or their agent) as you will need the certificate.
The major concern for a reaction would be anaphylactic shock. You will need epinephrine on hand, and all the odds are that it won't be used.
For those interested in what the latest protocol is from Dr. Dodds:
The titers after the initial series are not mentioned, but I feel that's an important part of this protocol. It should be done after a period of at least two weeks past the last vaccination.2013 and 2014 Vaccination ProtocolNote: The following vaccine protocol is offered for those dogs where minimal vaccinations are advisable or desirable. The schedule is one Dr. Dodds recommends and should not be interpreted to mean that other protocols recommended by a veterinarian would be less satisfactory. It’s a matter of professional judgment and choice.
9-10 Weeks Old:
Distemper + Parvovirus, MLV (e.g. Merck Nobivac [Intervet Progard] Puppy DPV)
14-16 Weeks:
Same as above
20 Weeks or Older (if allowable by law):
Rabies
1 Year:
Distemper + Parvovirus, MLV (optional = titer)
1 Year after the initial dose:
Rabies, killed 3-year product (give 3-4 weeks apart from distemper/parvovirus booster)
Perform vaccine antibody titers for distemper and parvovirus every three years thereafter, or more often, if desired. Vaccinate for rabies virus according to the law, except where circumstances indicate that a written waiver needs to be obtained from the primary care veterinarian. In that case, a rabies antibody titer can also be performed to accompany the waiver request. See the Rabies Challenge Fund website.
Titer Testing - Dogs Naturally Magazine
BTW, re: holistic vets in LI: There really aren't any. We looked for one for another member in your area, and it was difficult, if not impossible, to find one.
Socialization. I think you'll be fine. A lot of people have misconceptions about socialization, in that it must involve exposure to dogs. It doesn't. It means exposure to people, situations, noises, car rides, vacuums ( ) etc. etc. An older vaccinated dog is a bonus, but totally not necessary.
See Ian Dunbar's site for the type of socialization needed, which by the sounds of it, you've pretty much done.
Why Donβt We Adequately Socialize Young Puppies With People? | Dog Star Daily
And the downloadable PDF:
https://www.siriuspup.com/files/pdfs...ppy_SIRIUS.pdf
I hope some of this info helps you and others. You're doing the right thing. Good luck.