Buy the right tool for the job. The wrong tool can result in damage or marks. Any resulting damages caused without the tool, can cost more than the tool's cost.
Buy more 1911s to spread the tool cost over more firearms which will benefit from that tool in later days to come.
The cost of the tool also pays for convenience of not having to find a gunsmith/armorer who does have the tool; or sending the slide off for an unknown time period; and maybe the armorer's adjustment isn't exactly right for the owner/shooter. The tool can be used at the range and make micro-adjustments to one's liking. Perhaps one's grip changes over time and the sights will need adjusting again.
Sometimes a 1911 owner will need to be the first in his circle of acquaintances to have the right tool. Other times, those acquaintances will have the tool, instead.
The toughest decision is which tool to buy, there being so many; not buying the right tool at all shouldn't be the issue.