I like Wirth's deck a great deal, but as has been said - Wirth belongs to the French esoteric tradition, RWS & Thoth to the English esoteric tradition - by mixing up symbols from both you are in danger of creating an incongruence of symbolism, a mish-mash.
The crocodile for example, this isn't original with Wirth - it belongs to the school of Christian, Levi, Papus, Guiata etc., and it has a special meaning to them in terms of their attribution of the Fool to the letter Shin - which not only represents for them the element of Fire, but the astral light in which the fool's imaginings -- all his biases, superstitions, fears are reflected that stop him from moving on -- the 'dweller on the threshold' - and for them, as can be seen in their writings, the crocodile is a symbols of this 'dweller on the threshold' -- and you need to note too that such symbolism isn't isolated to a particular card, but links with other cards in their system - for example, shin as astral light connects with the Devil (the astral light is between the horns of Baphomet).
However, the crocodile is also used with the fool in the English esoteric system (it also appears on the Crowley/Harris Fool card for example), albeit via another train of exegesis than that through the French association of the card with the letter Shin -- so there is no mix up between the two different schools if you should go with the crocodile in this case. I don't see any problem in looking at French and English esoteric decks, if you should stick with as here elements of symbolism that are common to both.
One could also look for symbols in the TdM, without the accoutrements of attributions of the esoteric schools. If you are sticking with English style, then Fool is attributed to the element of Air - if you look at some of the Italian TdM and similar style cards for example you will find things on the Fool card such as balloons (the light-headedness or empty-head of the fool, folly) whirly-whigs (air as an element of force, source of energy, sense of touch - with the balloon also of innocence, playfullness, childishness), bells (air as a carrier of sound, sense of hearing), a rose (air as carrier of scent, sense of smell), a butterfly, etc., -- all of which might be associated/in keeping with the element of Air.