The best way to do what OOS?
Most of your options OOS that require jumping will be handled well enough by whatever jump button you normally use. You can easily wavedash OOS by just doing the normal wavedash input while releasing the shield button. (For example, I wavedash with L and shield with R, so I jump, then release R and airdodge diagonally down with L at the same time.) Using aerials OOS is also fine with just Y or X.
You start to hit some trouble with Usmash and UpB OOS. I don't use tap jump either, so to Usmash OOS I usually end up using Y to jump and then throwing my left thumb from the analog stick to the C-stick to do a JC Usmash. It's awkward but it's how I learned to do it. A better way might be to buffer jump by pushing up on the C-stick and then clawing with your right hand to input the traditional Up+A Usmash button combination. This is probably easier, and this is the method I would recommend if you wanted to make Usmash OOS a part of your options. (Which you should; the hitboxes on the arms come out on frame 5 iirc so it's a decent move OOS if you're lacking other options.) (Edit: Or, obviously, claw to Y with your forefinger instead of using your thumb to buffer a C-stick jump, and use your thumb instead to hit A. Either way works.)
As for UpB OOS, you can claw again. Claw Y with your forefinger and have your thumb on B. The input is basically the same as for an OOS Usmash; you're just inputting Up+B instead of Up+A. If you can't or refuse to claw, I've had limited success by sliding my thumb from the C-stick to the B button, inputting a buffered jump by hitting up on the C-stick and then immediately after inputting UpB. This method seems pretty difficult to actually input properly, though.
I hope that helps.