I'm guessing Ultimarc's E-Stick would be good. BUT, is the stick switchable to the diag from ABOVE the control panel or is it another one where you need to remove the panel or something similar to switch it?
No and no. It is "swichable" via software. It can act like a 2-way, 4-way, 8-way, 49-way or analog joystick depending upon which mapping is loaded into it.
You're thinking of the U360, not the E-Stik. The E-Stik can be changed by rotating the restrictor plate. This can be done without tools, but you do need to be able to reach inside the panel to do it.
Tex, sounds like you want
true 4-way restriction that's switchable to 8-way from above the panel, along with a properly restricted Q-bert mode. That means you are NOT looking for a 49-way or a U360, as those sticks do not have true hardware restriction.
What you
are looking for is a Mag Stick Plus, a (discontinued) T-Stick Plus, or an Omnistik Prodigy. Those sticks have a square restrictor plate for 8-way, which can be rotated 45 degrees to make a diamond-shaped 4-way restrictor. The non-Plus and non-Prodigy versions of the same sticks still have the switchable restriction, but not from above the panel, so they're out.
The Q-bert mode is achieved by leaving the square restrictor in 8-way (square) mode and configuring the software do diagonals only, just the way others have suggested. A rotated 4-way (Q-bert stick) is a 4-way (diamond restrictor) rotated 45 degrees. Guess what shape restrictor that is? Square restrictor! The square restrictor you get in 8-way mode on the above sticks is the
same thing as a rotated 4-way. This trick only works on sticks with a square restrictor- rotate a round or octagonal restrictor 45 degrees and you've still got a round or octagonal restrictor.