This isn’t a suggestion for typical cross progression.
I know cross progression is in the games roadmap, but I don’t want to buy the steam version and and effectively lose progress when cross progression comes out.
A solution could be to add account merging.
Let’s say on mobile a player beats gold stake on abandoned deck, and on PC they beat gold stake on red deck. If the accounts were merged, they would have both decks gold staked on both accounts.
Stats would merge into one and high scores would pick the highest score between mobile and pc.
This way players can buy the PC or mobile ports now and not have to worry about losing hours of progress when cross progression releases.