Sadly I can't help, it's not something I have tackled before - is there a local window fitter/ windscreen repairs/ autoglass sort of thing nearby, I'm sure they would have the tools, knowledge and experience....
2003 2.2hdi estate - mine 1998 Volvo 940 auto estate - also mine 2019 Citroen C3 something - the wife's PP2000 user, can help with faults / diagnostics in the Bournemouth area.
Not sure how you'll get on with the one in the scrap yard as the seal comes with the glass
& is secured in place with the window mastic.
If you remove the trims from the inside you might be able to cut it out but you'll probably damage the seal.
As ginger say's a autoglass place or bodyshop or main dealer could advise better.
2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power ) SOLD I've sorted the airbag light
1998 3.0 V6 SE coupe in Diablo Red ( my baby ) sold
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley )