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Midi Wizard is a VST midi processor made for all keyboardists whose gear is “simply” a midi keyboard and a computer stored with VST instruments. With Midi Wizard you can change the transmitting midi channel of your keyboard and/or transpose it on the fly, simply pressing a button and a key or using your midi keyboard's knobs/sliders.

Open it in your VST host application, connect the host midi input to the Midi Wizard's midi input and its midi output to the midi input of a VST instrument, then:

press and hold a button of your midi keyboard sending a CC message #105, set the desired transmitting channel pressing a key in the range C4 (channel 1) - D#5 (channel 16) and release the button: the chosen midi channel is shown in the Channel Changer's GUI. In order to come back to midi channel 1 (reset) simply press a button of your midi keyboard sending a CC message #106;
press and hold a button of your midi keyboard sending a CC message #110, set the desired transpose interval with reference to the C4 key (midi note number 60) pressing the corresponding (upper or lower) key and release the button: the chosen transpose interval is shown in the Midi Wizard's GUI in terms of upper (+) or lower (-) semitones. In order to cancel the transposition (reset) simply press a button of your midi keyboard sending a CC message #111;
instead of using the above mentioned "midi button + key" method, you can assign the "channel change" and/or the "transpose" functions to your midi keyboard's knobs/sliders via your host's midi automation system.
Of course, you can use only two buttons of your midi keyboard, sending respectively CC messages #105 and #110 and reset the transmitting channel to "1" and/or the transpose interval to "0" by pressing the C4 key.

You can change the CC messages used by Midi Wizard through the relevant drop lists in its GUI.

Midi Wizard has a "no hanging notes" function in case you accidentally play one or more notes while you are changing channel or transposing.