You should either bundle the DOS version with the game, or release it separately somewhere. If you broke the DOS frontend and don't want to get it working again, maybe release the last working DOS version?

Consider releasing on GOG. This game is great nostalgia bait, and if you release the DOS version, the GOG staff are quite experienced at building modern, cross-OS installers for DOS games and tuning DOSBox.

FWIW I never played this particular game but around the turn of the millenium I put probably over 100 hours in Trevor Chan's Capitalism games [1].

[1] https://www.gog.com/en/game/capitalism_plus