Yes - just crush it. I mean, it depends on the brand, but when I was prescribed ritalin XR the time release mechanism was so weak you could literally just scratch off the reddish coating to turn it into IR.
It's possible for there to be more advanced time release formulations which are crush resistant but I don't know if this is done with methylphenidate since IR is also widely prescribed and it isn't (AFAIK) considered a medicine with a huge abuse liability, more commonly the crush resistant time release mechanisms are used to stop people from enjoying their opiates too much. The world is fucked though and the pharma industry is full of cunts so who knows, if you haven't tried just crushing it yet though of course do that. It should be pretty obvious if it's gonna work IMO, the XR ones I had you could literally just break in half and a little white powder would spill out.