Hey Forty, I can't help with the adhesive, but a couple years ago I built a small deck out back that's supported by these:
https://www.amazon.com/Muzata-Adjustable-Pedestal-Flooring-Unilateral/dp/B0CNGT5Z27/ref=sr_1_2?crid=2QMEVDZVH6SU0&dib=eyJ2IjoiMSJ9.kf4a7ZfZ9wYDmQXh-uYE45TrNXiGGtuHSk64pnZ2EK3CXOqRcpjPh9hM_DCM61QiYkiwzTJwNOOEPjq8UgREBmq2wm_aR00916Rq5ji4Wv6KQNuOWiTQ5oCjp1yuhalqGhQWQ4kDrC_dHge9RIxmFFLZ5XxW5wmDPHSrT--jbiC5E9Xl5kWxu48lJipBtx9C2Ri3XVk9xQq5UwWaP2VBAAAPOLWTA_WP1wTw5J-qeL5FWB6vfiB9mR0ZNz9ynmozxUkQkG0E4v6lLt8_3_vbzQkbezXZcFwEttwgYmDb3G0.qGkdy_HPYl191YxQwkcaMgLl4jyc2hF5jDmo0j-qSFQ&dib_tag=se&keywords=Adjustable%2BDeck%2BSupport%2BPedestal%2B4X4&qid=1786579594&s=industrial&sprefix=adjustable%2Bdeck%2Bsupport%2Bpedestal%2B4x4%2Cindustrial%2C199&sr=1-2&xpid=3w_77oNgu3-mV&th=1
They could help with the leg leveling.
For the original MacGyver, he actually helped develop the show and got it on the Air. I'm pretty sure that the Network just paid him so that they could make the reboot.
I was just watching "The Librarians, the Next Chapter", which takes place in London, (I think). It this episode, a man walks out a window that's open with no screen. It occured to me that I can't recall seeing windows in old European buildings WITH screens. Do they not have screens OR airconditioning over there?