That's a great sign they're looking to do anything to find him a role so they can keep him.
My wife is from the PNW and has a fairly close friend from HS that works in the Seahawks organization and she says she's heard Bell's name brought up several times. I just got off the phone with her asking for clarification after texting back and forth and she is of the opinion that the coaching staff really like his work ethic and potential but just don't know if they have a spot for him solely as a D player.
Granted, she doesn't work in the "operations" side of the organization but more of what I'd call senior level PR/marketing and she did say she got a "background sheet" on him. Seeing TXST is what prompted her to text me, She said she doesn't normally get sheets on undrafted rookies, so that's definitely a positive sign that they're looking at his Special Teams impact also, and perhaps situational O, such as this FB play.
Take it for what it's worth, but I'd bet even odds of him making at least the practice squad.