Palmers can work at line level or as load boxes. Whether you like the sound is subjective. There are a variety of opinions, especially between the original and the reissued PDI boxes.
IRs are a more modern solution to the problem.
Another thought is to look into some of the other preamps out there, including other Sansamps like the GED series and the VT series. Dark glass also has preamp pedals that you can load IRs directly onto. The RBI is a fine preamp, but it does have a very distinctive sound that does benefit IMO from the warmth and taming added by a speaker cab. There are a lot of similar preamps that will sound more like what you want right out of the box. I think you’ll find the Palmer to be a pricey solution and a bit of a one trick pony. FTR I’ve had the RBI, PDI-05, and everything else mentioned above at some point over the past 10 years.
In fact, you could get a dark glass pedal and use it exclusively as an IR loaded if you want, but I suspect you’d use it for more than that.