Currently no, there is no way yet.
The exploit only runs throught the un-patched version of GTA: LCS. Unless there is a new exploit found that runs through the TIFF, this is the only way...
If you want to downgrade your PSP, you may be able to find the unpatched UMD at a rental store. Use my tutorial to downgrade:
[Tutorial] Downgrading a v3.03 PSP to v1.50/v3.03 OE
How to tell if your GTA: LCS is unpatched:
Article Detail - PlayStation Portable News - PSP Updates
I hope that helps
