Aww. Perhaps you can rotate the various uncomfortable chairs, supposedly different seating postures help. I'm reeaaly happy with my HM Aeron right now. Glad I made that investment now that I'll be sitting on my ass for the next few months or so.
I heard her saying to nobody in particular (even though I'm the only one in earshot), "Man, I really need a decent mouse pad." If she comes for mine it's every man for himself. I bought the Sayl because I was too chicken to spend the money on an Aeron. I don't regret it, per se, because it's a nice chair, but I also wish I would have just bought the thing I really wanted. You made a good choice.
Not sure if it's still an option, but you can have mouse pads printed, for example with the text "I want my Sayl back". The Aeron was an expensive purchase, but when I thought of it as "purchase to not kill my back, which is already weak AF from sitting in shitty office chairs since I was 8, any longer" it made more sense. I went for a refurbished one and can reccomend it. As good as new, lots of spare parts and they last forever anyway, at like 1/3rd the price.
Aerons are 100% essential to living. Yeah, I said it. I spend my life on my ass. We don't have aerons at work (RIP) and it sucked. When my sister was an architect at a multinational they bought ten of every single ergonomic chair and shipped them from office to office for everyone to try out. After six months they bought 1100 Aeron chairs.
That will make it all the easier to buy some aeron chairs when this thing is over. They're 100% made in the USA and about 95% recyclable. Not only that but every single part is available individually at a retail level, from Herman Miller, eBay and a number of other vendors. It is easier maintaining the health of an Aeron chair than it is maintaining the health of a Honda lawnmower.