Helen and KJK have both been interviewed by Meghan Kelly, and are mentioned often by her, so they have some level of name recognition with her audience - it probably makes them more attractive as guests for other podcasts who are heterodox or non-woke.
And I know Helen has been interviewed by Coleman Hughes, Peter Boghossian, and Jordan Peterson as well, so she’s making inroads with North Americans.
In the UK she’s tended to be on smaller podcasts but between Richard Dawkins, Triggernometry, and Andrew Gold (and the IEA) she’s building a presence over here. She’s often asked on for news commentary by LBC, Talk Radio, and GB News so who knows, some day the BBC might 'rediscover' her 🤷♀️🙄 and KJK is often asked to comment on those UK stations too.
I do like your idea of a Sex Matters podcast with Maya and Helen - one for their suggestion box??