So I'm sorry you're going through this, but a couple of things -
Your keratosis diagnosis isn't confirmed by biopsy, correct?
Keratosis has some subtypes.
Sebhorrheic keratosis is caused by an excess production of keratin, not the human papilloma virus (HPV). They are not contagious.
https://www.clarewellclinics.co.uk/genital-dermatology/seborrhoeic-keratosis/
https://www.aocd.org/page/SeborrheicKeratoses
You may be confused because sometimes, SK is known as a Seborrhoeic wart or Basal Cell Papilloma. This does not mean it's a wart caused by HPV, and papillomas are benign tumors caused by viruses. It isn't only HPV.
Actinic Keratosis are also known as sun spots, and appear most often where you've been exposed to the sun - face, hands, neck, etc.
https://www.aocd.org/page/ActinicKeratosis
So no, you don't have something caused by HPV, and you didn't get genital warts transmitted by a handjob. Your doctor denied the "whole HPV thing" because he knows it's not caused by HPV, not to spare your feelings.
I hope this helps.
Its very unfortunate that this forum outrightly disagrees with it. But if it happened to me, it means it happens. I would advise the community leaders to tell the people that handjob carries low risk of transmission of HPV and pls don't say 'hands don't cause HPV'.