A standard S1/S2 T3 will hold upto 2bar (30psi) boost for 4000rpm no problem. Been there and done that myself. Very much not recommended though. My turbo lasted for a year that way (was 20 year old to begin with) before it let go of one of its turbine blades. The new turbine set me back 100€ which wasn't the end of the world though. You will have stupidly high ACTs before the IC because you're way out of the compressor map with the turbo rpm. However a large front mount IC will take the charge air temperature down without a problem. Just scary to think what the boost pressure would have been before the IC.
A bigger T3 will make the same boost with more hp, lower ACTs, lower turbo rpm and lower exhaust manifold pressure and heat.