Senku, there is a relatively easy way to convert the palette in very little time.
1. Open a 1.09.4 wad.
2. Set the IWAD to the 1.09.4 version of srb2.srb.
3. Save all the wad's graphic lumps as bitmaps.
4. Set the IWAD to the 2.0 version of srb2.srb.
5. Individually replace every graphic lump with the corresponding bitmap.
XWE will automatically convert these bitmaps to SRB2 2.0's palette. Not so hard. Theoretically, you could convert every character you've made in a day, given that none of them have tricky-to-recreate SOCs in them.
1. Open a 1.09.4 wad.
2. Set the IWAD to the 1.09.4 version of srb2.srb.
3. Save all the wad's graphic lumps as bitmaps.
4. Set the IWAD to the 2.0 version of srb2.srb.
5. Individually replace every graphic lump with the corresponding bitmap.
XWE will automatically convert these bitmaps to SRB2 2.0's palette. Not so hard. Theoretically, you could convert every character you've made in a day, given that none of them have tricky-to-recreate SOCs in them.