You can convert the dobson mount into a equatorial mount with the use of a wedge or by redesigning the mount all together, there are heaps of people that have approached the problem slightly differently, I have had a great time researching different designs.
Then of course the other option is an equatorial table which is looking more and more like the best option, you can buy one (
https://www.bintelshop.com.au/Product.aspx?ID=7186 ) or you can try to make one. There are also heaps of sites about home made Equatorial Tables, just google it.