If you only need to draw a card for initiative, and dont need to handle them, shuffle them, etc., you could use a rollable table to act as a pseudo deck. Have the GM create a table with 52 items and add the images, then you'd just need to click a button to roll initiative each turn. Or you could set up a dice macro that rolls a d14 and a d4 (for clubs, spades, etc) and print that into chat. This has the downside that it doesnt track which cards have been used, so two people could roll identical results. But if its just something every player does once a turn and isnt used for anything else, that downside might be overwhelmed by the massive increase in speed and simplicity.