Remove or change ptime in SDP

I have a vendor deployment where ptime is set at 30 in SDP, and far end needs the value to be either 20 or removed from SDP all together. Whats the best way to accomplish this? Any suggestions/feedback will be much appreciated. I created an HMR as follows, which seems to work but I'm sure if this is the best way to tackle the problem. I was able to successfully delete the value by simply setting new-value null. I can get fancy matching different time vales from 30, I may do that if this ends up being the end fix. Thanks again.