Easy fix for split boots on plumbing vent flashings

I recently came across a plumbing vent flashing repair device that looked like a cross between a two-piece plumbing vent cap and Darth Vader's helmet.

Oatey Retro Master Flash 8 in. x 8 in. Vent Pipe Roof Flashing

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Plumbing Vent Boot Flashing Repair: Method 1 - Fine Homebuilding

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EAGLE 1 EPDM Flexible Roofing Pipe Flashing Retrofit Split Zipper Boots - On Site Adjustable Roof Pipe Jack Boot with Round Base (Multiple Sizes) (No.

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Plumbing Vent Boot Flashing Repair: Method 1 - Fine Homebuilding