We went through this process. Started with Airtable + Softr which took a weekend to demonstrate the desired functionality. But we switched to bubble + Airtable and launched in three months. Then we moved off Airtable to use the bubble db. Finally we migrated to Xano for the db because it has much better security. So bubble + Xano. We have 1,400 work flows and 40 API endpoints and 45 tables.