I'd distinguish between the separate issues of members' status and the modelling. On the latter, I'm struggling to believe the models as they are - they're counter-intuitive to say the least.Well then perhaps members of SAGE should be remunerated, on condition that they do not speak to the media.
This would put them in the same position as civil servants, who are also required to be impartial, and are not allowed to be members of political parties. (eg. Susan Michie)
The current situation is unsatisfactory, as SAGE (and Fake SAGE) seem to be running a media campaign to cajole/bully the government into doing what they think is the right course of action. They are not the government, and it is about time they realised that.
Their modelling has been shown to be incorrect on several occasions in the past. Any modelling should be independently peer reviewed to see that the model is accurate, so that the government can rely on the quality of the advice.
On the question of members, my view of remuneration remains tied to the question of how members are recruited. For an ad-hoc body, the remuneration seems a side issue - the bigger question is for how long someone should be barred from commenting on that subject having attended a SAGE meeting.