Omron B2R microswitches + Seimitsu PS-14-Gs?

I’d like to recreate the discontinued ps-14-gx buttons for my stick. Would these microswitches fit into the 14-Gs?

They will fit.
But the Plunger Slot will not mate with Actuator.

Will that have any notable impact on the action and feel of the button?

It should possible to cut out and glue in the plunger slot from an obsf-30rg but I’ve never attempted that sort of work.

Yes, you can cut out the slot from Sanwa and transplant to Seimitsu.
It has been done before by a Japanese guy.