The game’s FOV setting only affects the actual world FOV, not the HUD.
You should be able to scale the HUD on the image page of the vorpX menu. However, if vorpX can’t scale the HUD in a game, use the EdgePeek function for looking at the screen corners. Also useful for cutscenes/menu screens. EdgePeek can be enabled by clicking the middle mouse button or the left gamepad stick.
Touch controllers can be used either as keyboard/mouse or gamepad, in kb/mouse mode you can freely map them in the vorpX menu.