I am on VeRR as part of the BSG project run at some of our largest bases, having just left regular Service at 55.
For me the salary isn’t the attraction, more keeping in touch with what I had been doing for some 30 years along with most of my mates as well as keeping the old grey cells ticking over.
Whilst I can always say ‘no’ to any task given under VeRR, the Service will expect you to provide value in your input and I find it a happy balance, although with the current gapping I could easily find work to fill 5 days a week !!!
But it looks like your offer is a more ‘fixed’ working arrangement, so my experience may not strictly read across....good luck !!