I have had two girls once who fought off every other piggy that crossed their way. When one of them died, I was determined not to bond the other one with a boar. I was pretty sure that she wouldn't live with a boar since she has always lived with her sister. She was about 4.5-5 years at the time.
Tried to bond her with one of my girls living in my other group. The only one she was interested in was the boar of this group. But that was no option.
When I talked to a lady who ran a small rescue she offered a boar, a black teddy mix. The girl was a white smooth haired piggy, like her sister.
I was sure, it wouldn't work. But I took the girl to the rescue to meet the boar. She was livid.
I was sure, it wouldn't work, but I was persuaded to take the boar home and give it a second try.
Set up a bonding enclosure, put them both on. He had a go at her. And then everything was okay.
You just never can take anything for granted when it comes to these little devils.
I can understand that you're reluctant to bond Meg with a boar. But in my experience it is the safest bet in a lot of cases.
If your two young ladies are willing to accept the lad later one ... should work, but you never know for sure.
The biggest problem would be to find a suitable boar. You would need a real charmer.
(That's what I was looking for after Muffin died - and we got Odi. Someone had a good laugh at us.)