Hi and welcome!
Unfortunately rescue dating, the by far safest way of finding a character compatible new companion with the least risk of ending up with two boars that don't get on (plus avoiding all the other health and mis-sexing pitfalls that await the unwary by adopting from a good welfare standard rescue) is currently not possible. However, if you are not tied for time, it is worth enquiring about and going on a waiting list.
Here is some more information on how to best go about finding a companion with further links to recommended vetted rescues in several countries:
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Single Guinea Pigs - Challenges and Responsibilities (includes the specific challenges you face with guinea pigs that haven't had piggy company during the formative pre-teenage weeks as well as how to best go about finding company)
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A Comprehensive Guide to Guinea Pig Boars
A comprehensive guide that looks at all aspects of keeping boars and how to work around some of the tricky areas.
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Bonding and Interaction: Illustrated social behaviours and bonding dynamics (Contains lots of illustrated interactive key behaviours as well as specific information on boar-boar bonding)
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Neutered / De-sexed Boars And Neutering Operations: Myths, Facts and Post-op Care (All about neutering if you want to consider your boy living with a sow in the long term. Please note that neutering/de-sexing is considered an elective procedure and is therefore not performed in lockdown conditions).
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Rescue Locator (rescue link to non-UK rescues at the bottom)
We may be able to help you better if you please added your country, state/province or UK county to location in your account details (access via clicking on your username on the top bar), so we can tailor any advice and specific recommendations to what is relevant and available for you where you are straight away with just a quick glance to the left. It will save both sides time and effort since we have members and enquiries from all over the world and from very different backgrounds, climates, vet and rescues access as well as widely differing medical and other brand names. Thank you!