Most countries receive pr through multi-party agreements, you’re on the right track by suggesting a sortition as the government could put together a group of everyday citizens to review all the electoral systems in 3 months to recommend the best one. That then the British government must be pressured to implement with the other parties.

Ireland and New Zealand pressured their establishment politicians to do the right thing and they got electoral reform passed. So the same can happen in the UK. It’s just a matter of persistence and pressure from the public.