This is from a Nightengale article. Sounds like a lot would need to be worked out to make it happen.
”Two Phillies executives cautioned that signing Bichette remains a long-shot, insisting it would be complicated and involve significant roster changes, but that it’s certainly possible.
The Phillies would have to cut off negotiations with Realmuto, trade third baseman Alec Bohm and his $10.2 million salary, find a team who would take right fielder Nick Castellanos and pay at least a small portion of his $20 million salary, and perhaps move others as well.”