If I may offer a comment. IPA may marr some finishes (it did with a black Porsche this summer) although a few vendors recommend a squeeky clean surface or their own special cleaner before adding a sealant. If I remember correctly, the DP sealant you plan to use has a cleaner built into it that preps the paint for the sealant to bond so the IPA step may not be necessary after PO85rd anyway.
Personally, I came full circle to only using IPA to check correction after compounding/swirl removal or in situations where I need more than a spray detailer to remove M105 after correction. I actually just bought mineral spirits this week after my experience with the Porsche and may further limit my use of IPA. I primarily use WG DGPS and Fuzion after my polish/finish polish step without any issue and it eliminated any micromarring or light hazing from the IPA step.
If you really are concerned about checking correction or residual oils, a quick soap and water wash or rinseless wash with ONR should be more than sufficient to remove any fillers and oils from the compounding or polishing step.
If DP Poli-coat does remove old sealants and chemically preps the paint for bonding, there may not be much EZ creme acrylic glaze left anyway.
It doesn't mean you shouldn't try or use a glaze, but you might want to test the EZ cream in one section to see if it makes a significant difference. Since you are working with SS paint, I sort of remember that Megs #7 was supposed to nourish older, dry single stage paint and would actually absorb the oils. I'm not sure if EZ glaze as an acrylic finish will do that to the same extent as #7 but it would be very interesting to hear how it works for you.
You won't know until you try it and god knows it's been a while since I played with SS paint.
Good luck and let us know how things work out for you!