What i do understand from CCW is that 60 Months looks to be the maximum term that can be quoted, is this 60 months the official line in regards to official upfront pricing and term that can be presented as a price?
I've noticed this 60 month limit on Meraki Now as well. I would reach out to your distribution Cisco team to see if they know of anyway to extend it.
Things I would consider:
Maybe you can buy 2x 60 month SKU's in advance? Maybe you can charge your customer for 120 months now and then order the back 60 months with your distributor 5 years in advance (or remember to renew before 5 years). I know, kind of odd ideas, but there is always a way when $ is involved, right?
Good point that the SKU may no longer exist or could change by then.
Looking just at MSRP the most expensive 2 hour on site service SKU looks to be 50% the price of an MR46 as an example. Of course, there would also need to be a LIC-ENT-10YR.
Depending on details of the project it could make sense to order cold spares for each location or one per n sites in a certain geographical area. Labor would still be needed, but that are national outfits that could be contracted for that.
There is probably a size and price point of a project requiring 10 years of same day on site hardware with labor that this could pencil out. Conversely, it probably does not make sense for a sufficiently small project.