I just realized I never posted an update to this thread. I did eventually purchase both an axe and a shovel.
For the axe, I bought a
Hults Bruk Akka Forester’s Axe thanks to my REI dividend. It will serve double duty as an emergency tool in the Rubi as well as a new toy for camping and playing bushcraft.
For the shovel, I bought a spade from the local Ace Hardware. I considered one of the multi-axe/shovel combos mentioned in this thread as well as a couple collapsible shovels. But in the end I decided on a dedicated shovel with a 3' handle. It is small enough to store, long enough to use comfortably, and didn't break the bank for something that will not see a lot of use.
At first I thought I would be storing both attached to a cargo rack on top of the Jeep. This would definitely look the best! However a couple things came to mind. I didn't want to leave them up there as a tempting target for thieves or vandals. Also, I do not always keep the hardtop, to which the rack is attached, or the rack on the Jeep. But I still want the tools with me for emergencies. Not being the sharpest knife in the drawer, it had to be reminded to me that there is empty space below the rear seat. So in using that more efficiently, the axe and shovel are both placed nicely under it with some other gear and hidden out of sight.
I'm very pleased with the purchases and their placement. Now on to upgrading my cargo rack setup and augmenting my recovery kit... :)