Gran trabajo. ¡Felicitaciones!
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You don't need to. I just checked all of them, and they all modify different addresses in the base ROM, so you can combine them together with no problem at all.
Of course, maybe you want one IPS file instead of four, but it's really not a big deal. At least now you know you can do it safely.
EDIT: I'm a nice person. Here you go.
If you want to submit it to the RHDN database as an Addendum, be my guest, but make sure you properly credit all three authors! I can't be bothered...