Not that this is the main point of the thread, but there have been 'non-theist' Quakers and Attenders (Attenders being those who attend Meeting because they like it, are getting to know Quakerism, have sympathies with Quakerism but might not want to commit the whole hog, etc) for decades. It was one of the things that attracted me towards attending Meeting, and I still do from time to time. I don't believe in a god. I have though, enjoyed the indefinable quality of a meeting (sometimes called 'Corporate Worship', meaning that it's a joint affair) which seems to amount to more than the sum total of its parts. It's probably been the only area of my life that's a bit woo. 
I would, in my limited understanding of British quakers in 2025, agree with other more informed posters that this stance will not be universally agreed upon by all UK Quakers, and that there are lots of grassroots feminist Quakers who will be pushing back hard. I hope they prevail. Quakerism is, like others have pointed out, an absolutely ideal vehicle to capture and must be very prone to entryism. But at the core is a deep desire to ponder and think fairly critically, and not to be put off by others not agreeing. I hope that comes true in this case, eventually.
They've been very helpful to us GC feminists in recent years, accommodating GC meetings in their premises when other orgs were scared off.